Keep in mind though, Matt Smith's series won't be like that trailer at all, which did look awful by the way. The trailer is just made to make viewers aware of the new series and does not represent that final product in anyway.
Personally, I think people just don't like Matt Smith because he is too young (and looks emo, lol). Given that Doctor Who has almost always starred older, more expreienced actors in the role as the Doctor (Peter Davison was the youngest up untill David Tennant), it is understandable that fans have doubts of Matt Smith following in the foot steps of the previous Doctors.
With that said, I'll watch it to see how he performs. Also, keep in mind, it is really intended as a family show so it has to be a little bit tame, even if that means taking on a goofy actor.