Unfortunately they all are. I've heard that some guys are given leeway to improv like Triple H, Chris Jericho, Shawn Michaels & Undertaker, but for the majority the writing team does all promo. I know about Jericho's involvement in his character from interviews he gave on XM Satellite radio's Opie & Anthony show mentioning it & mentioning the few others that do too. There were one or two WWE scripts on the net a year or more ago that showed scripted promos. Also I've read a lot of SCSA interviews over the years & he would always say things to the effect that the over scripting is killing WWE creatively. The best thing about Austin was that he would call WWE on their faults to their faces. Paul Heyman put up a good article talking about how SCSA left WWE because the writing was shit & they wanted him to drop the belt to Brock without any kind of feud on a Raw instead of a PPV. The article was good because it had somethings in it that SCSA didn't have in his book, such as Brock agreeing with Austin's decision to walk out after learning about the business more. Heyman also mentioned how pissed Vince was because there was no confrontation between them.
I fully believe you on this, I guess it means that CM Punk gets more credit than he deserves.
Orton is now a clear face, his reaction after he hits an RKO is enough for anyone to be able to realise he is now a face. I agree that he has changed his in ring style, for example in his Wrestlemania match against Cody and Ted he was getting dominated but then broke out into speedy offense, exactly like a face. The fact that he is doing that pose again is excellent, really getting over that he is a face.