I thought Scorestreaks, where a flag or bomb were worth more than a kill in objective modes, were the best thing to happen to this game since support and specialist strike packages. Too bad they couldn't exist together.
HQ was fun in MW2 and BO1, but somehow I didn't like it as much in MW3 or BO2. Hardpoint was my least favorite game type in BO2, because the fact that it is active as soon as it spawns, and it always spawns in the same order, meant that people would just camp the next HP, which feels like missing the point of a moving objective.
Demolition. We need Demolition. There are no bomb planting games, SnD/R are about killing the other team. Demolition is the highest action game there has ever been, other than WAR is WaW. When I play Dem, I usually play other games after to relax.