Games you regret buying or not buying

Alright so I think it's safe to assume we all have a fairly large amount of games so I'm sure everyone has at least one game they regret buying.
As for me, I can only think of two which are:
Oni
Windy X Windam.
You know what they say, can't judge a book by it's cover.
Good thing is that Oni was only two bucks. Windy x Windam cost me like $20 and it played like a bad Street Fighter II clone.

As for games I regret not buying when I had the chance are:
Marvel vs. Capcom
Super Dodge Ball Advence
Fatal Frame series
and L.O.L.-Lack Of Love to name a few.

So how 'bout everyone else?

Haha seems like Oni gets pretty mixed reactions. Wasn't it one of the very first PS2 games?

I really can't think of any games I regret buying, but some I regret not buying-

ICO
Paper Mario 64
Zelda Collectors Disc
Phantom Brave
all of the Shin Megami Tensei games on PS2
a lot of PSX RPG's that are real expensive now

Heh yep it is, I'm sure I'd have a different reaction if I got it when I first got my PS2 but I bought Oni this year so it doesn't look so great.

Heh, I have the Zelda Collectors disc, my friend sold it to me for 10. I remember kicking myself for getting the SMT games but then I realize I don't have a lot of time for RPG's anymore. :lol

I regret not buying Panzer Dragoon Saga for the Sega Saturn. It was right in front of me for $29.00. Later, going back and realizing what I had walked away from, it was sold out. Years later it is very expensive and hard to get a hold of.