Don't like Will Ferrel?? (Then don't watch it and expect to like it).
If you have some basis of knowledge about the NBA and pre merger teams, it's actually quite original (while admittedly fictional). Aside from the meandering storyline, and a few outrageous scenes, this movie provides classic Will Ferrel humor. (Knowing that humor, you can expect some ridiculousness).
Laughs abound, with a unique cast: Woody Harrelson, Andre 3000 (Outkast), David Koechner (Champ). Cameos: Kirsten Wiig, Jason Sudeikis, Ed Elms (The Hangover). Indeed, Semi Pro is entirely underrated and will go down as a classic comedy similar to Happy Gilmore, Billy Madison (Those movies have horrible tomato meter stats also).
Maybe those who view these movies should stop looking for an academy award winning storyline, "that's unlike any other." Your unrelenting criticism of movies for being a clich√¬ (C), are a clich√¬ (C). Get over yourselves, stop taking things so seriously, and laugh. Life's a lot better that way. But more importantly:
E.L.E. (Everybody Love Everybody!!!).
And, embrace the "alley-oop."