I really enjoyed my time with the 3 chapters. I think playing co-op helped, some things would be a bit unwieldy playing it solo.
Gonna do the ranking.
MI2
CMI
SMI
Legend of Monkey Island
TMI/RMI/EMI
Obviously less of its own thing and playing on a lot of nostalgia, but I had a lot more fun with it than the 'newer' MIs. I think a Sam and Max style remaster might push TMI up a bit.