Yeah, my English isn't that good, but that doesn't bother me anyhow
About the examples that you gave:
*Half Life 2 (I said, any other game except Half Life series, or did I say it in some wrong way, so you didn't get me).
*Crisis - this one is just sucks...(don't know does it suck anything) this is kind of game, where you simply need to go from point A to point B, while moving you need to kill everything that moves...
*Far Cry (for me same as the Far Cry 2) - game without sole... same as the game above, simply moving from point A to point B...
The only thing that this games can offer is huge levels.. but that is just nothing against good gameplay.
You said that gameplay in Far Cry is so colorful, stealth blah blah blah...
But the reason you say that, is that you didn't play through all Modern Warfare, there are a lot of stealth and open combats (and other staff). AI is just great (to taste real MW you need to play on hardest difficulty), yeah it can't offer you a huge environment as Crysis, but still levels (and multiplayer maps as well) are just great! And I can say that crysis is very linear...yeah sure, you can move from point A to point B as you wish (via car or by walk) but still that doesn't make sense...