Smash TV/YMMV

Most Annoying Sound: The High-Power Grenade Lobber - EEEeeeEEEeeeEEEeeeEEEeeeEEEeeeEEEeeeEEEeee
Polished Port: Of course, the game was notorious for being Nintendo Hard. The home console version wasn't exactly easier, but with unlimited continues meaning you could play it without spending a fortune in quarters, it was certainly more enjoyable. One advantage it has over the arcade original is an actual soundtrack; in a developer interview, the sound engineer for the arcade game was instructed not to put too much effort into the music since the game's constant gunfire and explosions would drown it out anyway. The SNES port deserves particular credit here. While it doesn't quite have the enemy density of the arcade, it has virtually zero slowdown, despite having massive quantities of stuff happening. When you turn on fast mode, you also discover that, most of the time, the game was actually limiting the processing speed. That's why it has no slowdown; the code is so fast that it has speed to spare in most cases.
Those Two Bosses: Scarface and Cobra Head. Surprisingly, these two bosses are more difficult to survive than the Evil M.C.