Lets get the obvious out of the way: it's Chamillionaire of "Ridin' Dirty" fame, and he's sampling "Free Fallin'". The sample is...lame, to say the least. It's literally him rapping over "Free Fallin'" with a few drums thrown in, and that's about all that's changed from the original. He's doing this sing-rap thing, which is fine if you're good at it (Kid Cudi) and painful if you're not (Chamillionaire).
Listen Cham (can I call you Cham?). You're famous because of "Ridin' Dirty". PLAY OFF OF THAT. This whole trying to be a "legit" rapper bullshit is just that: bullshit. Have fun with it. "Ridin' Dirty" got so big because of its ridiculousness, and "Good Morning" takes itself way too seriously. No one cares about you anymore, meaning there's no reason to rhyme about your haters since as of right now no one is talking about you. Let loose.
I suppose I'm having some trouble with this track since I've been listening to the best "feel good" rap song of 2009 - Young Money's "Every Girl" - this afternoon, and while the two tracks are wholly different animals, their aim (to improve someone's mood) is the same. One fails, one does not. I assume you're guessing correctly.