I agree that Treyarch really took the mantle from Infinity Ward with Black Ops. I liked 2 and 4 a lot LOT, and hated 3 and 5 (didn't even really play 5, beyond a short bit of multiplayer with my cousin, but it was bad). I actually played a LOOOOOT od MW2 as well, but after I played Black Ops for a while, I went back to MW2, and I'm actually a bit ashamed that I enjoyed that mess as much as I did. MW3 was just MW2 with more problems (grenades were broken, spawn-killing was worse than ever, and deathstreaks are laughably stupid). Black Ops II is a fine iteration of the Black Ops IP, I guess, so I still enjoyed it (though the ability to load of on Perks is excessive).
With Ghosts, I was turned off after reading Game Informer's article, where they were saying they turned BOIIs Pick-Ten into a Pick-Twelve (I think), made 7 classes of Perks, and didn't count weapon attachments against the Pick-Twelve, meaning the Perks will be dripping off of people, they'll be so saturated in them.
I seriously hope we're not far from a new Unreal or Quake though, I really liked those games (started FPS gaming on my dad's Urban Terror account and Xbox LIVE gaming on Unreal Championship).