I've had one game go to the time limit in the last, oh, 100 games.
It must have taken me nearly that many games to get the uniform I wanted (shoot down 20 enemy air support w/blind eye)...that's how infrequently anyone gets a chopper. The last few installments, air support dominated the entire game...and it dictated how people played because it dominated the entire game.
Spawns are garbage, but, I find now that I spawn right behind someone regularly enough that it probably balances out. As much as I hate it, it's a built in anti-camp device. No longer can someone just keep their teams spawn behind them and be safe for most of the game.
As for the IR scope, I snipe with it, with Incognito on. If I'm sniping, it's a sniping map. Otherwise, the maps aren't 1337 quickscoper friendly, and if someone is "that" kind of sniper, an IR scope won't be an asset because they are rush snipers who will see you in plain sight before the IR even helps.
And sniping, it's an in between from other IW iterations where it was uber easy-mode, wreck sht with your infinite range shotgun, kind of bullsht....and BO1 where even the most talented snipers struggled to hard scope or camp-snipe.
Haven't raged over snipers in this game yet, and I just hit 2 days play time.
Lag and spawns, those are my gripes. Everything else is 2nd best to COD4 (if only there were more L3'ers than me and 1 other person).