My honest opinion on Christian being good enough? No he is not good enough to be WHC or WWE Champ. I'm sorry for saying this, because they are a lot of people on this site who love him, but he's just not main event material for the WWE. He has the curse of Owen Hart and Chavo Guerrero. He will always be held up to the standards of Edge much like Chavo is to Eddie and Owen was to Bret.
Nothing personal and Idk why this is the way it is, but it is.
Christian was great in TNA IMO, because he got to be his own person and away from the shadow of Edge.
The biggest and most glaring problem for Christian is that Vince doesnt find him as a believable Champion. That's it. On the mic he's great. His wit is fantastic. His in ring technique is spot on. Just that Vince doesnt see him as a main eventer... which sucks.
The reason his promos, so you claim, sound so much like the other wrestlers is because the same small bunch of people are writing them for everyone, and unless you're extremely high in the pecking order, you are given very little slack as far as spicing things up on your own. And because you are considered a low priority, not much thought is put into coming up with something creative or clever for you to say.
Don't kill the messenger. Your beef is really with the writing and booking team, as it is with a lot of stuff I see on forums, with the performers getting unjustly blamed.
I think Christian is good enough to be a main event star in WWE. I don't think he has much value as a main event heel these days, if his last heel run is anything to go by that is. But as a face, he is very over, and he does have god mic skills. He's also sound in the ring despite being a pretty small-ish guy.
Then it should come down to the delivery of the promo. Take Brad Maddox for example. His mic work may not be that great, but when he presents it seems like it's Brad Maddox and not just another wrestler. Remember all wrestlers are in the same boat so if guys can rise above the pecking order why can't Christian.