The GITS movies have a few of the anime cliches that some people dislike, but overall it's a good movie. If you are looking for deep philosophy science fiction, it's not all that great, but decent. If you are looking for good action and nice atmosphere, it's worth checking out. The 2nd movie had some 3d animations that were distracting but otherwise was good.
The TV series is a mixed bag. Some episodes are excellent and some are decent.
Overall the whole franchise is definitely a bit more appealing to mainstream moviegoers than most anime. I'd say it's worth a shot. If you see the 2nd movie try to get the one with subtitles and not the one with only close captions.