No way is LAMB underrated! It got voted the best Oasis B-side ever on this very forum not long ago!

Just cos a song isn't well known doesn't mean it's underrated (I said this about Angel Child before). Everyone who knows it loves LAMB (is one of Liam's best ever vocals after all).

All in the mind. It's great but nobody likes it, don't get it.

Who'll put on my shoes while they're walking
Slowly down the hall of fame?

This is such a hard call. It's not a question of which of those I like the best, but calculating how much appreciation I reckon each one deserves vs how much appreciation I reckon each one of them actually gets. By that metric, PYMWYMI, I guess. That intro is just such a great blast of energy, and I love the groove the song settles into.

Going by actual favorite, though, of the ones listed it's gotta be I Hope I think I Know.

Depends among which audience we're talking, really; what's rated by mental fans like us might not get such recognition from more casual listeners. For those who just know Oasis from their hit singles, you'd have to say something like Gas Panic or Roll it Over. Maybe even D'You Know What I Mean. For a more hard-core group like the one you'll find on this forum, I'd probably go with either To Be Where There's Life or Soldier On. Both good tunes with a great vibe that compliment the mood of the album nicely, and both all-too-often lumped in with Nature of Reality / Ain't Got Nothin' as part of the "shit second half" of DOYS.