Just so you're aware, I'm one of the few people to complete Fallout 3 on level 30 with all SPECIALs at 10 and all skills at 100.
Then MW2 is an RPG. I've chosen the role of sniper and have customised my character accordingly. He wears Ghillie suits appropriate to the terrain and his weapons are camouflaged too, by my choosing that role and style in the game.
If you directly control the actions - the car turns when you say so, the dude shoots when you press fire - it's a game but not a role-playing game. Role-playing games require a degree of separation - you say turn and the car chooses not to, or you say to shoot and a dice-roll says you don't - which B-Spec offers, but Fallout does not.
I'm not being funny, but there are dice rolls behind everything you do in Fallout 3. Every time you fire a weapon, it rolls the dice to determine how much damage
each pellet of the shotgun shell does, and how "accurately" it lands on where your reticle is pointing - the kicker being that, on top of the base weapon, and its condition, this is all based on the appropriate skill, it's governing attribute (and Luck) as well as any relevant perks, meds, rads etc. and whether or not you're undetected
and those same variables of the thing you're shooting at. Then there's VATS...
Oblivion was exactly the same, except maximising your character level required Zen-like concentration to avoid accidentally leveling the wrong skill!
This being because skills leveled as you used them, not only by choice at "Level-Up". Frankly, I prefer that method. I'd never have bought a "RPG" if it weren't for Morrowind's take on the idea, which actually started with its prequel, Daggerfall; Arena, before that, was a "proper"
pen and paper RPG, in a computer - like so many other games of the time, and since.
Anyway, if Deus Ex is a RPG, so is Fallout 3, in my opinion. The only problem with Fallout 3 is that it's hideously balanced out of the box. One tends to fall into the dominant strategy, rather than choosing one's own...
Is GT a role-playing game? That's a bit more ambigious, given that all games are RPGs, and that no game is a RPG, depending on how you define "role-playing"... A key factor is probably choice.
GT definitely has
elements of "traditional" RPGs, though - now more than ever.