I hate to give this a simply "good" rating considering what it once was.
It's unfortunate, the first two seasons were extraordinary. The characters, the plots, the episodes themselves, all amazing! Up there with the best television shows I've ever seen. Although the third season was slightly weaker than the two before it, it was still very good, and the fourth season climbed up to the quality of the initial two, and the fifth season was also very good.
The shows main weaknesses were evident during the sixth season, which was loaded with boring characterization and major plot holes. Aside from a decent resurgence of quality in the seventh season, the eight was just awful. The finale was detrimental to the series, and will go down forever in history as one of the worst series finales of all time.
I have a hard time recommending this guess I say watch it, and suffer through the latter seasons. The early seasons are topnotch.