Something needs to be done about the players leaving games mid-match. Either the bots need to be stronger (both a combat AND objective manner), players should be able to join a game that's in progress (unless it's like the last round or something), or there needs to be a penalty for leaving games (if there already is one, it needs to be a stronger penalty). It is very annoying having 1 or 2 of the 4 players on your team leave/go afk so the game is basically over because it's near impossible to win with a bot on your team.

Another thing I've run into many times, when I put a portal over an enemies portal, about 80% of the time, nothing happens. To my knowledge, that is supposed to at the very least take away their portal, if not also place mine. This is very frustrating because I will have an enemy jump through the portal before the game allows me to close their portal, then I'm dead