In general I'm mostly ambivalent about the Green Lantern comics. If the creative team is good- like Alan Moore/Dave Gibbons level good- I think the concept can go in some interesting directions. Otherwise its just issue after issue of paint by the numbers American superhero comics. With that said, as a character, Green Lantern is rather popular with the 200,000 people who still read superhero comics month to month though, so it makes (absolutely no) sense that they are making the hugely expensive blockbuster movie.
The trailer makes it look like DC is trying to replicate the success of Marvel's Iron Man, but with an even more boring protagonist (Tony Stark is only ever interesting when he is Robert Downey Jr, Hal Jorden is never, ever interesting) and a much less talented cast and crew. Couple that with the obnoxiously obvious CGI and I really have no interest in seeing this.