tbh I think that Mac loses the Ike matchup like 60:40
the best and easiest way to win against a Little Mac is by edgeguarding him
in order to do this we have to look at
1) how easy it is to win neutral against Mac
2) how easy can you convert your neutral wins into an edgeguard situation
3) how strong are your edgeguarding tools (in this particular matchup)
(obviously, there's more to a matchup than this, but this stuff is pretty important)
now, in the Ike scenario
1) Mac hates big disjointed hitboxes, huge range + good autocancels = we have to respect a lot of his moves, rushing in is no good with a bad dash to shield animation, walking is fine but it gives the Ike player more time to do Ike stuff
Ike's long jumpsquat helps mitigating this to a certain extent
overall I'd say they are pretty evenly matched in this regard
2) things Ike is probably going to hit you with in neutral: dtilt, grab, nair, fair
- dtilt: comboes into fair (-> Mac is likely going offstage)
- grab: uthrow fair boys (his other throws are pretty good too, having a very low angle of trajectory)
- nair: once again, it comboes into fair
- fair: offstage you go
3) fair alone would already be pretty ****ing deadly against a recovering Mac, but it's not even the best move Ike has for edgeguarding him!!
(I'm sure most of you know, but Little Mac cannot sweetspost the ledge with his specials) (well, actually he can but only during the beginning of his moves, like Cloud with climmhazard basically)
dtilt is a quick option that can hit Mac even below the edge, tho I'm positive that on stages with slanted edges like battlefield you can clip him with upB from underneath before he can hit you, it also does not cover a "high" recovery (aka Mac sideBing above him)
eruption, same usual story but easier to hit because lol it's Little Mac, can also cover a "high" recovery attempt BUT can still be clipped with upB
FSMASH, covers high recoveries easily, hits below the ledge AND can be spaced to avoid being clipped by upB even on slanted edges, I really don't get why Ike players like Ryo never use this move when edgeguarding a Mac, it's almost literally a win button
Ike has probably the strongest edgeguarding game of all the characters in the Mac matchup O_O
extras: Mac also struggles at landing (though he at least has a few options like a counter and a fast falling speed) ESPECIALLY against characters with disjoints, and Ike is pretty decent at this stuff too
positives: Ike has the right physics+hurtbox to be susceptible against Mac's setups for big %s windows, also recovering low can be risky for Ike thanks to the great ammount of armored moves Mac can use against Aether