It's kinda simple, and I think it will already have been mentioned in the posts above. The WWE in the last years has turned into way too much soap opera. It isn't wrestling anymore, it's pure, I mean just entertainment. Therefore, the announcers don't build what is going on in the ring, but the general psychology of the feud. Even though this could help remind us what is going on in the feud and the lengths that the two competitors have gone to to get to each other, it is more a disgrace than help. The two guys in the ring put on a show for the people and you are supposed TO CALL THE DAMN MATCH! I wanna know what the move that guy did is called, and build up excitement, build up the competitors etc. Most of the time the commentators just have a vendetta with themselves and try to get back at each other with cheap insults and not pay any attention to the match.
Thing is, it isn't really the commentators fault, at least not in my eyes. You do what you are told. Vince tells them to talk randomly, so they will talk randomly. There have been cases where Cold actually calls a match and gets me excited. JR was calling the match because that was his job and wasn't told otherwise.
We all know the importance of a good commentary, but if someone is to blame, that is the officials and Vince. What infuriates me the most is how the completely don't pay any attention to certain stupid feuds (Fandango-Santino) and talk about Bryan and the Shield and Evolution during their match. I mean, yea, the fans aren't interested either, but you could at least try and pretend that you care so that people might actually get to care too.
There are so many wrongs with the commentary now, but it is what it is because of Vince. I don't think Cole doens't know the moves or can't call the action properly. He is just told to biild the psychology surrounding the feud overall and not the match. The only cases where they call most of the match are high-tier matches. One that comes to mind is Cena vs Punk on Raw for the #1 contender's spot at WM against the Rock. Even though the commentary started a bit slow,talking generally about their feud, when the action started to pick up, they did too. I believe that's the problem many times though. We all know that a top - tier match isn't gonna end in the first 5 minutes, so we are just waiting it out most of the time and I think the commentators do that too.