1. The half-elf. Playing a RAW half-elf as it stands now would feel masochistic.
I like the half-elf in general, except for a few things.
The first is their signature power -
dilletante. The concept of this is good - get a bit of a freebie multiclass to reflect half-elf dabbling. However, you really have to plan your character around
dilletante if you're going to have any real use for it - you need to have a good ability score for the power you choose, or you're just wasting actions in combat when you use it.
I'd suggest that, like the dragonborn's
dragon breath power, half-elves are given a range of abilities they can base their
dilletante power on, to ensure that the power is useful.
Other things I dislike about the class include the
group diplomacy power - nobody's going to remember a +1 to diplomacy aura. Also, why do half-elves get extra constitution and charisma? That's nothing like elves, who get a bonus to dexterity and wisdom. It's also nothing like humans, who can be good at any ability. It's more like the unholy offspring of dwarves and tieflings.
My final dislike of the class is their ability to take feats from both humans and elves racial feats. Sounds good in theory, but in practice a lot of the best elf racial feats are based off their
elven accuracy power, which the half elf can't get!
So, in brief - fix dilletante so it runs off a range of ability modifiers, kill the diplomacy aura, change the stat modifiers to be more like elves and humans, and let half-elves take
elven accuracy as a feat choice, and half-elves would be a lot better.