Once a game devolves to 1v3/4, the match may as well end. Not that a 1v3/4 is inherently impossible (Dark Souls fan here), but it is just about impossible to take out 3 alone, let alone 4. Once one is down, another can break away and revive while the others remain engaged. And before you say 'just execute', if you can pull off a successful execution with two or three other enemies focused entirely on you, you might just well be fighting toddlers.

I'm no developer, nor a balance expert, but this IS the Feedback board, and it's my opinion that revives in Deathmatch, and possibly also Brawl, should go.