Seems to me that asking whether you should watch it is rather redundant given that it's a rerun from last season. In fact, it was from right near the start of last season. Although it does have some rather amusing moments.
it was on a night when MOST shows were reruns. though I find it odd that odd niche shows like this wouldn't use that as a night to try to gain new viewers. you know, "if you don't feel like watching football, watch an all new, super duper CHARMED!!"
ah well.