Robber: The game is practically broken without dual analog stick control, hence the PSP mediocrity.
thepik: yes, it's still a steal at $10. Everyone was 100% happy paying $20 when it first came out, then it clearanced to $10 and the rest of us were 200% happy. If you had bought it for $5, you'd have been too happy, resulting in failure. $10 is the perfect price for this.
We Love Katamari is also good (the PS2 sequel), but not as special as the original. This is one of those unique games where nothing can top the original because it was perfect.
I haven't played the games in years, but I still listen to the soundtracks to this day to get my Katamari fix.