Well, as usual, the hipster CGI haters flood the chat and hate CGI simply because it's new and slick.
I know this may BLOW your minds, but CGI isn't just pushing buttons. Every frame has to be rendered, meticulously crafted with every detail in mind and polished to perfection. It's essentially an artwork that is rendered over time as a moving sequence. CGI haters tend to forget that CGI is very difficult, which is the reason that fully animated films take 3-4 years to complete.
That being said, it can be overdone. The prequels used CGI way too much, and to the point where the quality was significantly downgraded and the sets looked fake. The characters were limited from portraying realistic and emotional actions due to the small sets, and it hampered the ability for the audience to connect with the movie.
From the trailer, there are plenty of shots where CGI doesn't appear to be used, and it's been reported that a lot of filming occurred ONSET outside Abu Dhabi. The CGI that we do see (x-wings, millennium falcon) looks like pretty quality CGI, with each scene portraying an atmospheric aurora. Pay close attention to the details; the clouds, fogs and x wings moving at different paces with respect to the distance to the camera, the contrails, camera work and lighting on the millennium falcon as it performs its maneuver. The CGI presented in this short trailer does look promising and I wouldn't mind if it's used correctly in the upcoming movie. This is in contrast to the horrible CGI used to create simple settings in the prequels which created a fake and boring tone. Already this cinematography in this teaser alone makes George Lucas look like a f*cking ret*rd.
But nope, you get letsrun nerds with barely an ounce of film making observation pounce on the CGI just because that's the same, old, boring argument that's been rammed into every hipster's head on the internet on popular forums/messageboards. Form your own opinion for once, you idiots.