I actually agree with this. I really liked S&K growing up, but playing it again it doesn't really seem as good as it's cracked up to be. It seems like for everything S&K does, S3 already did it better. When locked on it just makes the game unnecessarily long for my tastes. I would still say it's worth it if you don't have it though.
Depends on the clone. Most of them shouldn't have a problem with it, though I couldn't get the lock-on to work with my GenMobile for some reason (which ironically has the game by itself built-in like most of the AtGames models).