Having grown up with Starsky and Hutch, I enjoyed Nash a lot. A fun buddy series, with good chemistry between Johnson and Marin (who actually steals a lot of their scenes together). I can't understand why so many people compare it to Miami Vice, which was posing and pretentious, while this show has its tongue firmly planted in its cheek.
So the plots are far-fetched and the characters are a bit thin ... this is Don Johnson, not David Lean. There are enough car chases and pretty women to keep the guys amused (OK, so Yasmine Bleeth couldn't act her way out of a paper bag, but who cares?), and some nice by-play between Nash and his formidable ex-wives and daughter.
Don't expect rocket science here. This is definitely beer and crisps material, but enjoyable nevertheless.