An interesting review of movie 15 :
My link
While she seems disappointed, the review actually seem mostly positive to me because a long DC episode is what I expect from a DC movie, the fact that the gadgets aren't overused in a lame fashion like in the previous movies is a good thing. Also, not having guest characters is fine IMO since we then avoid the crappy BO or Kid fanservice. The only disappointing thing in this movie seems to be the DB having a big role.