How bad is it? Typical slasher fare.
Should you see it? No. For Wings Hauser completists only.
Carpenter executed in the electric chair comes back to kill with the tools of the trade. It's not as good/bad as "Toolbox Murders" which is similar in a way. It has a typical Wings Hauser crazy act, which is neither his best nor worst.
I wouldn't have reviewed this at all, except I just deleted three films and felt I had to start somewhere.