Eh I thought Super Metroid had the best boss battles of the franchise! Although maybe I'm only thinking of Ridley.
It's weird to think, but MOM actually felt oddly nostalgic to me - not for anything video game related, however, as I recently found out, but for the days when I used to watch Discovery Kids and particularly await new episodes of Flight 29 Down (a teen drama series) and Time Warp Trio (a cartoon series where three boys from the present and three girls from the future travel throughout history, though all six of them are rarely present in any one episode, and usually it's just three people heading one) - in particular there was an episode of the latter show where all three "protagonists" were seemingly faced with death (not death threats, death right there on the spot - one for throwing a rock at the Statue of Zeus in order to retrieve the book that the group uses for time travel, one for being a girl participating in the Olympics, and one for failing to pay for his meals at a futuristic diner located on the edge of space), and the cutscene where Adam leaves reminded me of that somehow. I think I enjoy seeing "heroes" getting threatened for whatever reason - or at least that's what I find most memorable.
I could speak for a long while about how I felt the game's quality might've been inflated for multiple reasons, but aside from what I mentioned I'm not going to talk about any of them unless you guys ask. I'll mention right now that I got MOM with an army of wildlife documentaries, though.
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Currently Playing - StarCraft
Hopefully Next Up - Final Fantasy VII, Metal Gear Solid, Xenogears