Free to Play pack pretty nice. The Ward is likely my favorite part to be honest, it looks really good, though it feels like some of the shader masks are a bit off on it and the courier. Courier is mediocre, nice spawn animation though. The Hud has a distracting light on the left, and I don't really like it (But I hate almost all the Huds)
Crow is pretty cool on the Pudge set, but deep down I wonder if the enemies are going to be able to see it fly off while I am fog, I hate the mask, and really think Pudge looks a bit silly in a ton of armor. Don't really care for the Offhand, and I find both the Dragon Claw and Jade hook better then the one in this set. I'm not a fan of the new hook animation, the hook sort of teleports near the end of the animation.
For the Sven set, I actually like the more subtle parts. The mask is dumb looking and the Hammer is too plane, but the most of the armor pieces are nice. They aren't anything gaudy like I normally prefer, but they are minor changes that do look good. Back spikes are silly though, I'm keeping my giant ass shield.
For Doom, the new weapon is really awesome, I'm a big fan of the wings too. The mask is odd to me though, I find the closed mask too much, but the open mask looks really bare. This set is by far my favorite of the bunch, the entire thing looks really nice.
edit: Oh god, Valve tied all the Sven Sword animations to the gem, it looks silly to see him do the Hammer Strike with a normal sword. I think they should keep those tied to the sword. Also, I'm getting a bunch of broken particles when I ult.