The only thing not to love is when you're in the middle of one of the biggest blizzards of the century and down in Tribeca at 2:30 AM trying to get on the train, when the MetroCard ticket machine says SEE AGENT, but you're in a station with only automated machines, so you have to fight your way through the blizzard to search for another uptown train.
You know how the MBTA says that they are going to do away with toll collectors in the subways. You'll still need them to handle all the ticket misreads. I paid $8 for (4) trips, after using (2) trips the card wouldn't work anymore. (see above) So I had to buy (2) more trips. The next day when I brought the tickets up to a real person at a ticket window, she told me that the ticket was blank and never had any fare added to it.
Hmm.
She was wrong, but adamant.
Now I have a souvenier of my trip to NYC.