Please, please learn how to write concisely. Your walls of text are simply unnecessary. If you go to college/university, this will be a skill of great value to you.
First problem is you are creating hay-men arguments by not reading what I am writing - this is becoming really irritating.
I did not simply say MW2 was like another game, I said it is VERY similar to a 2 year old game. The two statements clearly have different meanings, with the latter showing that the game should have developed into a much better game, ideally of course. As the game is almost identical to it's 'spiritual' predecessor, this has not happened as many poor design choices were made. Clearly you like being pedantic over the word bad, so I will elaborate on what it means other than "OMGOSH OPINIONZ!":
Bad = "Not achieving an adequate standard" and "Disagreeable, unpleasant, or disturbing"
This is MW2 to a tee. "But what defines adequate and unpleasant!" you cry:
"Sufficient to satisfy a requirement or meet a need."
That need should be three things:
1)Make the company money - Success
2)Be enjoyable for players - Debatable
3)A game, as with any product, should meet the criteria of being comparable to other similar items in the market
If the item comes out highly, if can be considered a good/successful game, as in a game which fulfils it's meant requirements (See above).
Now if we take MW2 and compare it to similar games on the market, it is average at best:
1)The MP is very dated as there have been many innovations in the gaming industry. For example moving spawn points, large-scale combat, vehicles etc
2)The lobby system is very limited compared to many other games. Dedicated servers are known to have less lag and to provide more player choices. This is generally favourable for the player and so it would make sense, that to achieve the above aims, that a game should aim for this.
3)The FOV is smaller than in other FPS. This is not favourable to the player in terms of ease of the game and for a players enjoyment (Just google the outcry from PC owners).
The problem so far has been you assuming the words good and bad are entirely to do with opinion, which is not the case.
As I have shown above, the game has some undeniably poor features, which on the consoles, are left over from a game now two years old. In that way, MW2 is a bad game.
Yes, you may enjoy it, but enjoyment & quality do not go hand-in-hand for everyone. I myself have been gaming for too long to look past a badly (see above)designed game and therefore I will not find it enjoyable.
In conclusion, what I'm trying to say is that the game you are enjoying is a bad game, but that doesn't mean you, personally, won't have many hours of fun from it (See Snakes in a Plane argument).
I'm guessing if you do philosophy, you will understand higher and lower pleasures, which this is similar to. As a teen can enjoy getting drunk, you can enjoy MW2, but I'd prefer a more refined drink & game.