The problem is that the way its laid out does not support movements in a reasonable amount of time unless you happen to be along one of the primary spokes. If your trip involves the outer parts of the green line your completely screwed, it stops every 2 blocks so it takes forever to get anywhere. I used to live in Coolidge Corner and work near Alewife, that is a 15-20 minute drive that took around an hour and half on the T, in T cars packed so tight you were reaching through and around people to hold on to a bar. I despised that trip, if it weren't for the fact that a parking space costs $300+ a month I would never have done it.