Yeah, Melee bombs were undeniably better. Two mechanics that I've seen don't work are the aforementioned lack of explosion on shield, and the inability to grapple cancel with bombs. The latter isn't as big a deal, since really only Mike Nasty employed it as more than a "gotcha" one-time trick, but it's still a nice gimmick to have in your pocket if someone's being cheeky with their spacing against bombs, even though grapple beam has less lag, now.