My take on it is that JJ will do fine with ep 7. He isn't the best choice, but he's more than capable of dealing with the project.
My biggest fear is that they continue to go CGI with everything. For me, the one main factor the OT worked was because they used real props and made real sets. They built so much for the OT that it made you believe the stuff actually worked and existed. I don't care how good any actor is, but if you actually build a nearly lifesize falcon and have them run around on set with that as their ship the response in acting is so much better than saying, hey here's a blue screen, pretend there is a 100 foot spaceship here. I would put the battle on the Tantive up against the 10,000 battle droids and clonetropers and the overblown battles they showed in AOTC and ROTS. I don't need to see 5,000 ships engaged in air battle when a handful of TIES and Xwings provided plenty of suspense and entertainment. Even to this day you can watch ANH and it doesn't feel dated. Not to me anyway. You can't beat a real person in a costume when compared to CGI characters. Even R2 lost his little quirky charm because they chose to have a CGI R2 for most scenes, same goes for yoda.
It's for these reasons that I think the right choice would have been Chris Nolan (if he would even have been able and willing to do it). Nolan's approach to Batman was to make real sets and real props and try to use as little CGI as possible. He used miniatures in the Dark Knight even though he could have just done the scenes with CGI. That's the kind of approach I think they need to go with the next trilogy. Make real sets that look lived in and weathered as opposed to shiny, brand new crap and cut down as much as possible on the CGI. Oh and a great script wouldn't hurt either.
Also Disney if you're listening, how about you get Jerry Bruckheimer on board to produce the rest of the SW films. The guy has the midas touch when it comes to producing movies.