I downloaded a 700MB version after getting sick of waiting for the larger 3GB version, but it still took a while to download, but it was worth it of course. Family Guy rocks. This quick "review" will cover some of the formatting of the movie, so if you can consider some of this to be spoilerish, I'm warning you now. Turn back or risk not being able to laugh at one of the punchlines.
The movie is set up to begin with the cast showing up for the movie, and this portion of course has a mix of good jokes, as well as some of the jokes that are starting to get a bit overdone (see: 'unnoticed Meg' jokes). After everyone gets into the theatre, some funny "Coming Attractions" are given, and then the movie gets going. When it begins, it feels a lot like any other Family Guy episode, and for the most part, that is what the movie is. The same sorts of jokes and humor, but we get a lot more of it in one watching (unless of course you purchased them on dvd or watched some marathon, or downloaded a bunch... but.. that's illegal...ahem).
The core plot of the movie doens't really get going for a while in, but that is excuseable since the movie is shown to be split into three parts (although to find where one ends and another begins depends on how well you know the comic writing of each of the writers... I couldn't tell where the lines were drawn, for what that may tell you about how dedicated of a fan I am..). Hitting on the basic plot now (last chance to turn back!!)
~~~~~~~~~SPOILERS??~~~~~~~~~~~~`
Stewie is going about his usual Family Guy antics until he tries to spring a trap on a rival child at a swm meet/lesson. The trap backfires and Stewie gets a brief view into hell (very brief), which causes him to decide to change his ways. Somewheres along his line of trying to be a good person, he decides that this doesn't work, and takes Brian's suggestion to get into alcohol.. the movie then takes a turn off of that bit of plot when Stewie sees a man that resembles him on television and decides to find the man to prove that Peter isn't his father. When he finds out this man is actually him from the future, Stewie hitches a ride with Future Stewie to find what a horrible world his family has grown into. When it is put upon him to try and change everything back to the way it should be, it is made obvious to him by Future Stewie that it was the incident at the swim meet and his near death experience that changed his outlook on taking risks in life and what affected his lack of a good future.
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When the movie ends, we get more of the breaking of the fourth wall when the Family Guy cast has a post-movie cast party. Then the movie finally hits the credits, and there isn't anything to see after the credits are finished rolling.
What did we really get out of this Family Guy movie? ... well, the animation seemed about on par with what is usually expected, and the show wasn't leagues funnier, or more dramatic, or anything than the tv series.. so all we are really getting differently is more jokes and more Family Guy than the usual dosage, a shot at a bit longer of an arc, and some swears and sexual suggestions that go even beyond that of the tv series. There are more "eating out" jokes in this movie than I think I've ever heard on tv.
So do I suggest you watch it? If you are a Family Guy fan.. of course!! If you aren't.. of course!!! It's funny either way, but don't expect something AMAZING.