The more I check out, the more stupid stuff I find in this game.
Even the way the menus are setup is fucking hilarious stupid. Get this.
From the main game menu, you can choose to enter any of the 7 games available on the disc. Well, I have the game set to "hard" which means that I only get 9 continues. So, I play through the game, and I run out of continues, and it's game over. Well, it let's me enter my high score, and then it kicks me back to that game's start menu. The only problem is that since i'm out of continues, it refuses to let me start over. It's literally like having an arcade machine, in that once you're out of continues, you're done playing. Meaning you have to exit out of that game, wait 10 seconds of loading, then re-enter that particular Metal Slug game, and then start from there.

It's so stupid it's funny.

The other hilariously dumb thing is the menus, and the buttons that work on them. For instance, in the middle of the game if you press the pause button, you can't just un-pause the game by pressing the same button, nope, you need to press a different button to un-pause the game.
Every time you exit a game, it asks if you want to save your control settings, regardless of whether or not you're actually changed any control options. It just asks every time.

When navigating menus, the d-pad on the Gamecube controller works just fine, but the analog stick is dead. You enter a game, d-pad is dead, and analog stick is now active.

You can't make this shit up, it's the kind of shit that only SNK Playmore could fuck up.