I really like Attack of the B-team, and play it every nighte with the homies atm. So many wacky things to do. If I was to add one thing, it would be a more ballanced progression in the game for server use.
I'm playing mp and this is my first real try with a modpack. Until now I've been running a vanilla server. Around 2 years.
I love starting over in minecraft - fresh map, new start, seeing if I can make it with out dying, building a small base, and then bigger with all the neat stuff. A steady progression from setler with nothing to castle owner. Later in the game it's cool if the gameplay comes closer to creative in the sence that you can fly and easily get lot's of goods.
But in ABT you can fly as soon as you kill a bat, and if you summon minions, well you hardly ever need to mine either. These things you can do from the very start. I love both features, but they are to over powered and to easy to get in my view. If they consumed some expensive resource, or hard to achive gear, that would be better.