What a weird movie. Because it features a doll as one of its main characters, it was marketed toward Chucky fans and boasts about how it's directed by the guy that did the original Leprechaun movie. Well, it's certainly not like any Chucky movie and it really doesn't strike any similarity to Leprechaun either.
First things first, I wouldn't call this a killer doll movie. There are certain kill scenes in it which involve the doll, or "Dummy" as it is referred to, but the real killer in this movie is the young lady named Angelina. Her brother, who we are led to believe is some sort of awesome ventriloquist, spends most of his time bumbling around the screen looking like Justin Long had contracted some intense level of autism. The doll is voiced reasonably well by Bruce Weitz, but is not at all scary.
I'm not entirely sure what Triloquist is trying to be, it's listed as a comedy/horror but it doesn't really succeed well enough in either category to be considered a good comedy or a good horror movie. There are a bunch of giggles to be had throughout with its crude level of humour, but it's not an overly funny movie. There are some WTF moments in the film, including its ending, and I guess that is really the only type of audience that this movie will truly appeal to.
So if you like really weird movies, Triloquist is worth a watch. It's not a good movie, not a bad movie either if you can appreciate its quirky and silly nature.