Not enough mobility compared to other characters. C4 recovery is a ***** at low % (more than in vbrawl), slower walk speed when holding nades, heavy character so he gets comboed to hell. He has a few buffs, but he's definitely not high tier anymore, harder to camp with as well since everyone can like dash cancel, dash dance, etc. And he gets edgeguard ****ed a lot.
I found it was easy to pick up, cuz it would have been a good follow up to melee. Sure it's no melee, but I think the parallel is similar to 3s/SFIV. I would never be able to catch up in 3s now, but SFIV is more accessible to people. You still need skill to play it (1 frame links, match up knowledge, etc.). Same for brawl+. In vbrawl even if someone was good, it was hard to show it with a 2-3 stock if you were playing a non top tier. In brawl+ you can actually 4 stock people with a lower tiered char if you're better than them lol.
edit : oh yeah, normal range on ftilt and utilt, and ftilt gets two hits at low percentages, but at higher ones, the second hit has to be delayed, or you have to combo into something else since the first hit pops you off the ground now.