What exactly makes Brinstar so good? Aside from the sharking, and lava forcing those to approach?
Isn't brinstar quite small, leading to earlier kills on MK?
Proper use of the elevation -- particularly on the right side of the stage -- prevents rigid zoning/projectiles (i.e. Falco lasers and Zairs) while providing optimal spacing for Meta Knight's Up-B (he can cancel it in even more ways and faster by using the platform's relatively unique height as yet another mix-up in Meta Knight's already burgeoning list of options). Up-B is not Meta Knight's only move that is suited for the terrain. Meta Knight's curiously well-fitted Ftilt that barely reaches above the stage (a limited gimmick in itself), will out-last
two spot dodges when using lag orbs, Dtilt can be used as an entirely safe anti-air that beats virtually all characters' aerial options, including air dodging, an Fsmash that has similar spacing qualities to Ftilt and can simultaneously -- semi-safely -- refresh Meta Knight's move set while damaging the lag orbs so that the stage will separate. After the stage is separated, Meta Knight's B is nigh unpunishable.
Meta Knight can't be killed if he isn't above the stage where the opponent can interact with him. Just allow yourself to be hit by the acid and tech into where the stage separates (I do this in tournament [against good players] and I typically live past 200% and take a stock when I would otherwise deal some damage, make a mistake, and be hit by a kill move). If your opponent is smart, they will catch on to this and punish your tech, which requires most of the cast to heavily telegraph such a plan to the point where you can mix-up your recovery more than normal due to the condition of your opponent. This long life is ok though, because your opponent -- who
can't effectively stall in a "Two Snakes One C4"-type situation -- now dies much earlier than normal. Enjoy living three times as long as every other character when they lack a way to affect you unless you
choose to be onstage. I'm not going to go into exactly how good sharking and acid is for Meta Knight, since you asked to exclude it.
Also, this is all very manageable within thirty-five ledge grabs, which doesn't even matter since most rule sets only enact a ledge grab rule when a match is taken to time, which your opponent won't have a method to do unless they are using Meta Knight.
Have fun and play safe kids.