[*]Resilient (Con) + War Caster allows casters to essentially never fail Concentration checks because of damage (99% odds of passing DC10).
--It's dc 10 or half damage taken. You need to go back and read the rules.
The thing is, damage rarely goes over 20. The adult blue dragon deals 66 damage, sure, but once you get to that point, it's more a matter of dying than losing concentration. Further, monsters rely more on multiple attacks. That same Blue Dragon's most powerful non-breath attack deals only 18 damage...4 points less than it'd need to raise the DC to 11.
[*]Necromancers can summon ridiculous numbers of skeletons, which are perfect dungeon-clearing tools and do surprisingly large amounts of damage.
--At high levels? Seems like the high level monsters could take out swaths of skeletons pretty easily.
Not really. Monsters don't seem to be specialized very heavily in AoE damage. Again, blue dragon has lightning breath...that it sprays out in a line. Which means that most of the time it could hit only two or three skeletons. With the necromancer class feature, the dragon would actually need multiple bites and whatnot just to defeat a single skeleton. Meanwhile, the skeletons ability to focus fire off a single bonus action of the wizard's means that a relatively small number of them can defeat a blue dragon reliably in one round. Jack has actually brought this issue up in the necromancer thread:
http://www.enworld.org/forum/showthread.php?358145-5-0-necromancer/page3&p=6359150#post6359150
[*]5e's flexible spell prep and rituals system means casters sacrifice less than ever before to have their plot-breakingly versatile utility toolkit on tap.
--Most high level spells can only be cast once per days, and require an extremely cost amount of materials. I don't see this a broken at all. We have no idea how much gold you should have at high levels/
Rituals can be cast at-will and don't consume a spell slot, only that you spend 10 minutes casting them. There are plenty of powerful spells with no expensive material components, like Feeblemind, Finger of Death, Fire Storm, Flesh to Stone, Fly, Foresight, and more.
[*]Bards can poach Ranger/Paladin capstone (level 5) spells starting at level 10, when Rangers/Paladins only gain access to them at level 17. By poaching smites the Bard can easily outdamage a Fighter.
--I have no earthly idea why you think smite is a spell you can steal? It's a class feature. This point is completely and utterly incorrect usage of rules.
You're mistaken here. In addition to being able to burn spell slots of damage, the paladin also has several smite spells on its list. Searing, Banishing, Blinding, Destruction...all of these can be poached by the bard and have powerful, crippling effects.
[*]Eldritch Knight and Arcane Trickster casting is pretty pitiful (level 4+ spells are where it's at, and they only get 1).
--They aren't casters primarily, you seem to conveniently ignore all the other stuff they get. Strawman argument yes?
I think that it's an issue of how little synergy or theme there is with the classes, which is unlike the case with the pathfinder Magus or 4e Swordmage.
[*]Even though the Sorceror is worse overall than the Wizard, Heighten Spell is utterly broken.
--I don't see the problem, you spend resources to give a creature disadvantage on saving throws of a spell? Okay.... ?
When you have spells that can immediately end a fight, making them extremely reliable is a problem. Sure, Legendary Resistance mitigates this problem a bit, but not every challenge is going to have that. To see what I mean, check out Jack's chart on how the Sorcerer's mechanic disrupts the saves:
[*]Magic Jar allows you to permanently (until dispelled) take over another creature's body while simultaneously trapping their soul in a jar, able to perceive its surroundings but not to move or act in any way. Nightmarish. And overpowered - you retain your Int/Wis/Cha scores and class features, so it's a great way for a frail Wizard to get a big beefy body.
--Until the container is destroyed of course. You don't seem to be taking creatures into account with any of these points. Probably because we don't have the monster manual and you are looking at everything within a vacuum and not within the context of the game world.
Wizard has several spells that can take care of this. Secret Chest and Demiplane spring to mind, which makes it rather impossible to break the container.
[*]Fighters 'going nova' with 6 or 8 attacks look exciting, especially if you're able to give them Advantage or if they can use a maneuver to get it, but after doing so they're stuck playing the same way they did at level 1.
--I don't understand why this is a problem? Seems like you are grasping at this point. Perhaps you think everyone needs the same complexity? In which case 5e simply isn't for you and thats OK. You can find another game you enjoy.
I think the issue is that at level 7 or so, a wizard has completely different capabilities and approaches than they had at 1st level. The fighter doesn't, and the problem only gets worse the further the game goes.
All in all, I think you need to calm down. Jack has a lot of criticisms, but you can't be too quick to dismiss them just because you haven't taken such a close look at the game yet. It's okay for the game to have issues. Being aware of them means that players and GMs can work around them. Trying to ignore them doesn't do anyone much good, and can lead to bad experiences in actual play.
