Also not happy about the grab bag of nerfs. I mean, they nerfed Cloud of Daggers? I haven't seen anybody actually take that spell since the days of pure PHB I.
Something about the Wall of Fire change in particular rankles me. I think it's mostly that they took something incredibly simple (start your turn in the wall or enter the wall, take damage) and added something else to track ("Wait, did this guy already take this damage this turn?")
The various changes from 'start of turn' to 'end of turn' were predictable, but are still disappointing. Flaming Sphere, a fan favorite that has survived since the original publication of the Player's Handbook, is now a much, much, much less attractive option. The only good news I can think of is the fact that this is a playtest. Maybe if we complain loud enough, we can get some of these changes rescinded? Or, at the very least, get some buffs in exchange for the countless nerfs? The Scorching Burst < Freezing Bursts has always bugged me.
And while I'm sure I'll be in the only person in the world to complain about this, I'm disappointed and confused as to why they took the Fear keyword out of the Prismatic spells. Most people will interpret this as a buff, because undead and constructs will no longer be immune to these spells. But I have a build that needs a Fear spell, and they were top pick. It's really, really, weirdly hard to find a Fear spell, these days. Or a decent one, at any rate.
Anyway, the constant changes to parts of the game that already worked fine continues to rankle me. I keep making characters I really like, only to have the rug pulled out from under them on key powers or elements. I'm honestly considering picking up another system to play for a while, just to get away from the whole, "Oh, your character who was awesome a month ago sucks now, sorry about that" thing.
EDIT: I initially misread Wall of Fire. It seems the 'adjacent' damage has no limit, which is nice, and which helps. I'm still worried that an enemy can get pushed through the Wall of Fire, take its damage, and then on its own turn, waltz right through it without taking damage again. It just breaks immersion apart for me. I'd feel a lot better if it was once per round instead of once per turn, I think.
Also, I must admit that it's not all bad. Half damage on a miss is nice. Not great, and I'm not sure why it has suddenly become the Wizard's shtick to deal half damage on Encounter powers, but even those who are disappointed in these changes (like me) have to agree that this is a buff.