Most recently, Onimusha: Dawn of Dreams. I've uttered that four-word phrase many, many, many times during my DoD play sessions (there really haven't been all that many of those, however, because the game just completely sucks.) Part of the problem is that I really loved Onimusha 2, and everything that was good in that game is bad in DoD.
Graphics:
Oni 2: Good
Oni DoD: Better, but no photo-realistic pre-rendered backgrounds
Music:
Oni 2: Atmospheric, immersive
Oni DoD: Okay, but not as memorable
Length:
Oni 2: Long enough to feel nice and meaty, short enough to encourage more play
Oni: DoD: Way, Waaaaay too long
Bosses:
Oni 2: Few enough of them that the game retains a bit of that survival horror feel, bosses are tough but fair (especially if you understand the magic system)
Oni DoD: At least one boss at the end of every level, often two. Bosses never get stunned, can't have their combos interrupted, do insane amounts of damage and just overall suck
Controls:
Oni 2: A bit stiff with the whole "no analogue stick use" thing, but very precise overall
Oni DoD: Very sloppy. Impossible to cancel out of combos once started, slippery controls in general with the blocking/evading
I could go on forever, but I'll leave it at that.