With a lot of complaining, gnashing of teeth, and people buying the product anyway ;)
Not happy about the DLC either, but I can see why they did it.
Anyway my thoughts -
Online needs fixed. It does seem a bit laggier than other games (cept KOF), but this is probably because of the onslaught of people jumping on the game when it first comes out. Also there's some glitch that causes sound/music to drop during online matches. They say it's because of lag, but this is AMERICA. We're the land of poverty internet and it's going to lag. Considering the US is their biggest market for these games, I'm pretty sure it'll get fixed eventually.
Gameplay is... interesting. Definitely a lot different than other games because there are a lot of possibilities for juggles and a few OTG moves. Tekken characters have a buttload of command normals just like they do in Tekken which will probably be a bit disjarring to people who try them but have never touched a Tekken game. Super/Ultra moves are a bit like Marvel where they are easy to pull off and combo pretty easily. On the downside I don't know if the damage per meter usage would be worth it, unless it was guaranteeing a kill.
Some people might be disappointed at the limited number of stages. Some stages are multi-tiered, some are not. Not a huge fan of the stage designs, but maybe it's because I prefer old 2d background styles. Also the music is overall pretty good.