Am I the only shooter fan in the world who isn't head over heels for COD4, but wishes he was?

I'm on my second renting of Call of Duty 4 and I need to figure out once and for all if I want to buy it or not. On the first rent I finished the single player campaign and found it more tedious than fun, while I thought the online was high quality but just didn't do it for me for some reason. This latest rental I'm obviously focusing completely on the multiplayer and while I'm enjoying it somewhat more than last time, I still can't decide whether I really want to buy it.

One problem I have with the game is that all the maps I've played on seem really dull - from the settings and surrounds, to the graphics and that so many of the buildings/rooms seem like they've been copied and pasted on each map. But the fact that I feel that way strikes me as really odd considering that you could argue Battlefield: Bad Company has all of those same characteristics and yet not only do I own it, it's my favourite game right now.

On the positive side, I really enjoy all the little touches Infinity Ward have put into COD4 online, such as the sheer amount of weapons, perks, gun add-ons, challenges and the variety of multiplayer modes. Also other even smaller touches all add to the experience, such as two levels of crouch, grenade proximity indicators and instant replays of your death from the killer's point of view.

So the dilemma continues..