Parody that falls far short of original series. If you're a fan of the original series and not interested in seeing it parodied, I suggest giving this movie a miss.
There are various "golden oldie" songs throughout the movie which were enjoyable to listen to and sing along to but some of the footage that accompanied these songs seemed overtly and unnecessarily sexual.
The characters of Starsky and Hitch seemed considerably less concerned with fair play and honesty than the TV series' counterparts.
The highlight of the movie was probably the cameos of David Soul and Paul Michael Glaser in the last few minutes of the movie. Amusingly, Soul's character was dressed identically to Wilson's character, as were Stiller and Glaser's characters, Glaser and Stiller in Starsky's leather jacket and Soul and Wilson in Hutch's standard style of outfit.
There were a few clever gags (literally a few, three, I think) but some of it was rather obnoxious and parents should be warned, like many remakes of old/older stories/series, a lot of this is NOT suitable for children or young teens. The TV series is suitable for a fairly young audience but I'd probably prefer not to show the movie to under 15s.
Starsky's character changed throughout the movie with no really clear reason why. I found this bizarre.
I've been there, watched it, and am unlikely to ever bother with it again.