He is a effective zoner as well as some good close range options which although unsafe, can be very effective. He has a tool against every character (Except Toro, Sly, and Sir Dan, or at least I haven't found one yet) and is one of the only characters to completely nullify EC giga punch. I can see why people say he is useless, I met a black belt Sackboy recently in rank, and he was horrid, but maybe it is because I start taking a rank match seriously when another Sack is around instead of playing casually.
And he has a lot of potential that even I found out I don't know everything about him, and I learn something new everytime I spend an hour or 2 with him in practice mode. I bet most people didn't even know he can use a grab, a fan, and teleporter, and jam in one ap burst combo.
Basically what I am trying to say is that he isn't useless, and I dare anyone to try to convince me that he is.
I think he's a great character. Can you tell me more about that AP burst combo with the teleporter and fan? And, also, how does he completely nullify Evil Cole's giga punch? Is it with the bounce pad shield?
Sackboy isn't useless, however I really feel that he's a little awkward to play after the patch. His moveset is very runaway and zoning based, most people online still try to play him this way too. He just doesn't have the best melee options and maybe the only chracter that doesn't have an attack that gains 30 AP on it's own (except for the fully charged rocket).
Lately I have been play as sackie and his just a blast to play as. Specially beating those Raidens and Kratoses with him.