You're right. By hiring first a manager who has been very successful in MLS while playing a possession oriented, attack minded style, I think we can feel confident that the players brought in will be system fits.
(The rest of this stuff is just general, and not really a response to
@Falastur's post. He seems to be pretty well up to speed on the league.)
For guys that haven't watched MLS much the last few years, the quality of play has improved immensely, but also, the attractiveness of play is really on the upswing. I believe that as far as being a spectator friendly league, it's already surpassed the Championship, and in some respects, beats some of the big leagues because it has a very low tolerance for diving while maintaining elements of physicality that many English fans seem to admire.
From what I can recall of all the squads this year, the only "big" MLS club that doesn't always try to play the game is NYRB, and that's somewhat due to their coach's style and somewhat due to their lack of anyone to play the playmaker "10" role. But they aren't awful to watch because of Henry's superb ability to create chances for himself and teammates, particularly in quick attacking moves. They just aren't going to work the ball around the box to create a chance. They don't have the right type of players. There are only a few teams who play the 90s hoof and hope style that it seems like kind of dominates Championship football, and I think those squads are just being pragmatic about their players and financial situation.
All that to say, I think those unfamiliar with MLS will be surprised. It's a fun and exciting league to follow due to all of the above occurring in the context of a system that requires deft personnel management strategies to eek out marginal separation from the parity of a salary capped system.