I'm calling this an "experience" rather than a "review", because a review wouldn't really encapsulate how enjoyable this movie is. If I was forced to review the movie, I'd talk about how slow it is in the beginning, how although some of the dialog is witty quite a lot of it is hackneyed (a scene with SLJ telling JM to "Be strong" was especially cringe-worthy), and the climax didn't have a lot of tension and was a bit disappointing. Five stars out of ten sounds about right, and is perhaps a bit generous.
But I came out of the movie with a smile on my face, because it was fun. The audience was really, really into it. When the title of the movie appeared, everyone cheered (I haven't seen that happen in a movie theater since Episode 1). Every over-the-top "death by snake" was cheered and applauded. The people who were going to die were fairly easily identified, and people eagerly awaited their death scenes. (In a nod to the movie writers, I expected one character to die for being a complete jerk, and they surprised me by having that character survive.) And, as could be expected, when SLJ delivers his much-discussed line towards the end of the film, the audience cheered throughout its entire delivery. I laughed; it was just fun to listen to the audience.
This is not a movie you download via BitTorrent. This is not a movie you watch on cable, or rent via DVD. This is a movie you watch in a crowded movie theater. Because only then will it be fun; only then will the energy of the movie and the audience make the experience worthwhile.