Meta Knight doesn't suck, or anything close to sucking. He has amazing combos, aerial game and recoveries. Every b-move of his can be used to recover, mach tornado eats projectiles and shuttle loop is great for KOing and recovery. He has good edgeguarding capability, just lacking a lil' in KO move variety, but the ones he does have are great. Dsmash hits front and back, Fsmash makes a nice horizontal arc, though it's kinda slow, and you can always gimp people off the top of the stage with Usmash, chasing them with Uair and a nice tornado at the end. Or you can just chase them off the edge of the stage, since his aerials lift him up a bit, you still get plenty of jumps for recovery and one of his b-moves.
As for Lucario, I can't play with him. Literally. My disc got scratched and now Lucario doesn't load. =|