Rush is fun. I enjoy it a lot and really like some of the changes like the objectives varying their spawns on the maps which really mixes the mode up a bit. However theres also clearly some things in it which DICE really need to get on and sort out to save this mode because theres lot wrong with it and overall its one of the worst Rush modes they've released for a BF.
My 1 suggestion and biggest problem with the mode. 12v12 needs to be 15v15. There are a few reasons for this, I don't feel 12v12 allows enough freedom in team balance to be able to effectively deal with the vehicles available as a team. Mainly though, it is a terrible oversight to have the squad size set at 5 but not have these non 64 players modes being set to have player counts in multiples of 5. Squadding up is a big issue in Rush at the moment because 12 means 2 squads of 5 and then 2 guys left over. That's not right. It doesn't give them a fair game in terms of spawns or squad score. Those 2 are always at a disadvantage. This is a big problem DICE and it needs to be sorted in the next update because its one key thing that contributes to people just giving up on the mode completely.