If this is not the right place to post, please point me in the right direction:
1) It takes forever to determine connection to most games
2) Sometimes you can't join a room, with "room is full" error message, even though in search it clearly states that there are open slots.
3) Searching for custom game, players should be able to specify the number of players. I don't care for sorting through 6 slot rooms.
4) Search should not display rooms with no available slots
5) Character selection screen does not memorize your choice of character, stage and soundtrack. I constantly need to navigate to my character, and every time manually select random for stage and soundtrack, why can't the game remember my selection, so that I only need to do all this just once?
6) In ranked games, character selection is hidden from your opponent to prevent counter-picking, but before the game begins you can see his/mine main character. It's obvious that 99% your opponent will pick his main, therefore the hidden selection is not effective in this particular situation. You need to rethink what information is given before the match is accepted.
7) You should be able to save replays for games you observed, not only the ones that you played.
8) Create a forum-like page for players to post their replays. This page should give the ability, to players that download, to comment on the replay and some sort of popularity/rating system is needed as well. This has existed for RTS games since forever and is a great success, it's a shame fighting games haven't picked this up yet.
Just some food for thought for your guys.