My tips:
If you have a PSP, play MHFU or I don't care.
If you playlo Halo, being able to beat your friends doesn't make you good. Being able to beat people who are good makes you good.
If you're using a kart in Mario Kart Wii, you're not winning.
That said, don't play Mario Kart Wii if you care about winning.
There are better games out there that you've never played.
Just because Koreans take it seriously doesn't mean it's good.
If you're not having fun, you're not doing it right.
If you want specific advice regarding gameplay for any vaguely popular game, just go to GameFAQ's. The community's larger, more knowledgeable, and set up specifically to tailor to such needs.