This may be a bit controversial, but I will be honest: wizards are now incredibly boring. I cannot say that Arcane Power didn't help: it did. But post-Arcane Power, it's just that much more obvious how boring wizards really are.
For one, you have a controller class without as much control as other controller classes, that is an off-striker that doesn't strike as well as the other controller classes, that just doesn't have the sense of builds that other classes have. You can hand me any wizard build and I can hand you a complete power and item list - and this doesn't change much no matter what class path you choose. The end result is that there is very little variation among wizards, which makes them seem even more cookie-cutter than the other classes.
A wizard is also one of the few classes that doesn't benefit much from a strong secondary stat. For example, a CoW invoker gains a lot from Con. A lot of powers key off their class path, and a high Con can really help. A CoP invoker, by contrast, gains a lot from Int - and they will be built rather differently and have lots of different choices available to them. Wizards gain only a little from their secondary stat, no matter what it is. More powers now key off of their path (up from ZERO), but it's still not a real difference. Staff vs. Orb vs. whatever - your secondary stat doesn't really define you like with other classes, and therefore wizards can have very similar stats despite having very different class paths and focuses.
On the other hand, wizards need ALL stats (except Str) at least a little bit! ALL wizards need at least a 13 in Con, Dex, Wis, and Cha. So you end up with a spike in Int and a dump stat in Str, and all other stats just bump around a bit. Every wizard class path could be played with the exact same stats and be fine. Sure, if you have a wand you might boost Dex a tiny bit more or something similar, but honestly wizards are the first class I've seen where your 4/8/14/18/24/28 stat boosts don't all go into the same two stats. Besides Int, you could hit one of many stats each boost. In other words: there's no clear focus as to what you're trying to do.
But most boring of all, there is still only one viable wizard build, and it's still broken. If you want to play a wizard, Arcane Power basically said: "oh look here's some summoning ideas and some illusion powers you already had for free and some other options and oh wait you're still just going to be an orbizard, aren't you." Wizards have GAME BREAKING daily powers and incredibly "meh" everything else. So exactly two or three times a day your teammates will roll their eyes as you destroy everything on the board, and then the rest of the day they'll ignore you. The total number of "vs. Will" attacks that lock down went up; the addition of cunning implements is now solid; you can even still wield your orb or staff in your off hand and gain bonuses from it. So what do you do? Well you can either play an underpowered class that suffers from having paths that are all exactly alike and not really do much damage or control, OR you can do all that AND break the game a couple times a day so you feel better about yourself. Which would you choose?
Believe me, I desperately want to love playing a wizard. I've been doing so for months, all with the hope that AP would come along and fix some of the most busted-up parts of this class. But honestly, AP made them worse. You still have tons of useless encounter powers that don't really do much and a whole ton of dailies that are so overpowered that they make encounters not fun anymore.
I mean, it's still not as bad as what Storm of Blades is doing to the game, but it's damn close.