1. Spawning System
because i spawn and then die 2 seconds later
2. Over Powered Guns (FAMAS, M16)
because for the FAMAS and M16 it is one burst one kill
3. Semi-Automatic Guns (FAL & Striker)
because the FAL & Striker people get mods for thier controlers that make the guns unstoppable.
4. Lack of guns that were in the single player but not in the multiplayer
because a lot of people like the guns that are in the single player but most of them now are not in the multiplayer.