Rebel1one1 said:

I don't believe his credibility will be tarnished. The reality is Abrams has been a very successful director in spite of some of the mediocre products he has been responsible for. Star Trek Into Darkness comes to mind immediately as being an example of a completely lackluster effort that should have knocked him down several thousand pegs. It's scary that he went from Into Darkness to Episode VII. However, yes because he is an uber-fan of Star Wars hopefully this will be his greatest film as well as a wonderful Star Wars movie. The only reason I disagree about the argument of him being a fan playing a big role in him taking on the movie as director is because Abrams himself used that as one of the main reasons why he didn't want to helm the film. It is not like he was not aware that The Force Awakens would make a "shit ton" of money when he was initially offered the job.

One of the reasons I believe in him is because after Into Darkness he needs to redeem himself and this is the perfect opportunity. Not only that, due to him being a fan this would cause him to try his damnedest to make this film special.

Like I said before maybe he initially thought Disney was only doing another Star Wars film just for a cash grab, but then maybe he was convinced that they intended TFA to be a good film. And even if money was the primary reason he initially neglected to direct the movie that doesn't mean he doesn't intend on making a good film.