It is silly with free weekends... they make people buy the game, because all games are fun the first week. But Activision/IW (and Treyarch partially) does everything to sell more games.
That is just business though. There are plenty of businesses that is all about lying, which is even more silly.
MW3 can't be saved. It is so noob friendly (I know a lot of people would prefer this) and you can't be that superior guy, rushing around and raping with an Olympia, as you could in BO.
Trial accounts would be much the same in my opinion. A little less silly though and i would accept that.
They don't really need to make any kind trial/test thing, they have 3 CoD games in the top 6 most played games on Xbox for the last several weeks. And MW3 doesn't get better by being free for a short time.
Title should be: "MW3 Free Weekends - Is the game that bad?" (singular, there is only one game)