Well..., for meta knight, I tend to stick on the ground, playing defensively. I try not to get put in the air, but when I do, I try to bomb jump stall and then fast fall missile cancel, or bomb jump away to the ledge. I like pivot grabs in the matchup, but otherwise, I punish the meta knight's approaches with up-smash if the try a dair, or a f-smash if they try a short hop nair. Zair makes them impatient and go high. Up-smash. Missiles make them impatient. Pivot grab or f-smash. Or maybe I have beenplaying against only aggressive meta knights that the defensive ones could potentially beat out everything I've done so far.
Hmmm. Wanna tell how you would rather beat those matchups? Do you wanna pressure them? Out camp them? Jump around projectiles and pjnish them? Samus can out camp, so maybe not that, but maybe you want to rub camping in their face in a less campy way? Diddy kong and bananas give you control if you play them right. The peanut gun helps beat out marth or link's recovery, unless they know how to swat the peanuts, or glide toss around them... opinions?