you should consider 2 things:
1. the game is developed for european gamers of course and people over here really don't care about the MLS so it's no priority to have it the way it is in real life. There is still work to be done on some of the lower leagues in the big football countries which is much more important right now. I guess that's one reason why the developers don't have the real life rules for the MLS.
2. the databases are researched by the fans, not the developers. I know that because I've helped creating the German database for years. The only thing I get is a free copy of the game.
My review is a 9.5 because it's such a quality game. The only thing I don't like is that they still can't get the financials 100% right. Bayern München is so underrated in the game, in real life their one of the richest teams in all of sports and in the game they have to sell players to not get broke.
The community of the game gets 11 out of 10 because it's the best community u'll ever see. I have helped creating the databases, created a lot of facepacks and helped people when they had problems. And I did that for free. U wanna know why? Because we're a big family and whenever u have problem with the game u can be sure there are at least 10 people that'll help you immediately. There are guys that spend all of their free time to create facepacks and actually never have time to play the game. That guys are heroes.