Are you kidding me? You obviously didn't play summoners very much did you? Because an invisible summoner, standing back about fifty feet so that whole 50% miss chance never comes up, obliterates most opposition if played well. Give me an invisibility spell and a wand of Summon Monster 4 and I can trash monsters well above my pay grade all on my own.
And as a DM, I could easily crush such a PC.
Why?
First off, there is no Wand of Summon Monster 4 in 4E. You must be thinking of 3E. There isn't a single wand in 4E that can summon a creature TMK.
So, let's make an assumption here. The summoner has to use a move action to sustain the Invisibility (as opposed to the Standard action that the Invisibility spell requires today). In other words, a lot stronger than the current 4E Invisibility, but slightly weaker than the 4E Greater Invisibility.
Most encounters don't have 80+ by 80+ foot rooms where the summoner can hang back 50 feet most of the encounter and still attack. Most encounters are in 50 by 50 or smaller areas that fit somewhat easy on a gaming table. So yes, sometimes there is a large enough area to stay out of charge range, but often, there isn't.
The monsters ignore the summoned creatures and attack the summoning PC. Move and charge if possible, or worse case shift and charge. +1 to hit. The monsters know exactly where the PC is, so the Invisibility doesn't prevent attacks in any way.
If the monsters have area or close attacks, invisibility doesn't help the PC versus those attacks at all.
Summoners are typically squishy with lower defenses, and an invisible summoner is shouting that he is a threat, hence, destroy the threat. Normally, a Leader is the biggest threat (once found) and a Striker is the next biggest threat (the biggest until the Leader reveals himself, typically by healing). But an invisible summoning PC just puts himself near the top of the list.
Granted, a PC could use Stealth to up his protection level a bit, but that runs into its own problems. As an example, Dex is usually not a high priority Wizard ability score. So, maybe +2 Dex, +1 race, +5 trained, and +2 misc results in a +10 at most (+8 more reasonably) whereas the monsters will either be in the +0 to +2 range, or in the +6 or +7 range. Other summoner classes might have a higher Dex, but most other summoners like Druids do not have access to Invisibility too often.
And if the PC is putting ability point scores into Dex, he's not putting as much into other ability scores. That means that some melee and ranged attacks will be against a low NAD.
Plus, Hiding requires not talking above a whisper. As a DM, if the summoner cannot talk and is hiding, then the party Leader doesn't know when the summoner is bloodied or seriously hurt or has an effect on him. That means that as DM, I wouldn't allow a player of a Leader PC to heal a hiding summoner or give him a save because the Leader wouldn't know that the summoner needs it. If the summoner asks for healing, fine. Then the Leader knows to heal and the monsters know where the summoner is.
I'd also require that the player of the Hiding Invisible PC take his miniature off the board and tell me as DM where his PC is after each move. That way, none of the other players know where that PC is unless that player makes an active perception check.
Quid Pro Quo.
PC Sorcerer: "Sorry dude. I didn't know you were in that area when I blasted the monsters."

Course, I might do this for any hiding PC depending on circumstances because hiding shouldn't give out of character clues to the other players. But, hiding almost never comes up in combat, so it's usually a bit of a moot point.
And if the monsters are focusing on the summoner and the PC Leader is trying to help that summoner, that means that the PC Leader is typically having to stay within 5 squares of that summoner. That puts the PC Leader (another high value target) in amongst the monsters. He cannot both hang back and try to help the summoner.
Invisibility and hiding is a two edged sword. The monsters are hindered a bit, but so should the other PCs (and hence players) if the DM plays by the rules and/or by not giving other players info they shouldn't have.
If the hiding PC moves more than 2 squares during an action, he must make a new Stealth check with a –5 penalty to remain hidden. So, once the monsters are on top of the summoner, he has to stay in their vicinity, or he usually gives up his Hide advantage. And the summoner only makes a single Stealth check to hide, the monsters each can use a minor action to do an active perception to find him. The odds of a summoner staying hidden are not that high. And, only one monster needs to find the summoner. The rest just go attack the square that the first one did.
Granted, the summoner doesn't even need to Hide. He could just summon a creature on round one, go invisible on round two, and then move (or for some summoners double move) around the battlefield, always trying to keep multiple other PCs between himself and any foes. This tactic might even work in some scenarios, but it's probably wishful thinking in many scenarios because the monsters can often still get to him (with the exception of a few monsters that might be locked down by a defender or controller).
Finally, most summon spells are Dailies. So this "uber tactic"

Sure, if the DM is a noob, or unaware of how the rules work, or not willing to take off the gloves, those tactics might work on a consistent basis. But, because Invisibility is a Daily (assuming it was a Move to maintain and not a Standard), it also means that the summoner only gets to do this trick once per day, twice per day once he acquires Greater Invisibility.
I'm not impressed and don't see where this is any more uber than a dozen other tactical options in the game that are even stronger. A simple one is "My Eladrin teleports up to an inaccessible or hard to reach place, and then rains down attacks over the entire battlefield". This tactic negates nearly all melee attacks, the majority of attacks in the game system. It cannot be used every encounter, but neither can invisible summoning. Course, if your DM does a lot of two dimensional encounters with little in the way of 3D directions, then this isn't something that one could do a lot. But, all tactics have pros and cons.
Special note: when the Invisibility spell was first written, there were no summoners in the game system. To assume that the designers knew that summoned creatures combined with invisibility might be potent and how summoned creatures would work is disingenuous. Once they brought them in, summoned creatures changed each time because the designers over-nerfed them the first time out.
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