Not going to vote yet, but as discussion, here are my quick thoughts:
Swordmage, Genasi, and Drow - I'm cool with them, and haven't seen any problems discussed on EN World.
Feats - also don't recall reading about anything broken, but want to take another look.
Paragon Paths - also don't recall reading about anything broken, but want to take another look. Not likely to come into play anytime soon, anyway.
Dark Pact - On it's own, and used in a standing group of real-life buddies, this is fine. However, I too am concerned about how it would play here, on PbP games with shifting groups. There is a lot of possibility for upset party members, and/or Dark Pact warlocks never getting a chance to leave the tavern.
I think those are the big elements. I'll take some time this week and look at the book again more closely.