C-roa is not good for beginners (in fact, I probably shouldn't even play him), my bitching about him is the stuff of infamy, but I'll try to keep that out of it.
The basic problem with C-Roa is that in addition to a game of melty blood you need to play two side games of resource management and bookkeeping, those orbs and lighting charges aren't free; you need to give stuff up for them.
He's got low damage without meter, lightning, or orb setups; and if you want free TK orbs or orb>lightning charge you need to give up even more damage and go for a combo ending in 2C trip for knockdown. In addition to having to give stuff up and work for your resources you can lose them easily; getting knocked down wipes out your orbs, and you lose all your lightning whenever you use it in a combo or a setup. You also need to work for orb activations, it's not like Aoko where you just negative edge them, you gotta input it again and do an animation to set them off. Orb combos are hard and you need the perfect setup to do them.
When you add in stuff like his near-zero crossup potential, and his air-blockable DP you get a character that's not friendly towards anyone in general.
That said he's awesome, he has awesome combos, and his 236C is some sexy shit.