Definitely worth a watch. Great acting. Sad ending, but it clearly shows that people not always as they seem.
****Spoiler****
The ending raises some questions,
Why did Norman killed his brother? Was it because to save his own? (Was he afraid that the sheriff know that he was involved too). Is he the cold blooded person in the whole story? (As easily managing and trying to solve the problems with the murder and than easily shoots his brother too to avoid problems). Francis seemed too comfortable when Norman came back like she knew what happened already.
Was Francis comfortable too leaving his own father at the end like she doesn't care if he dies there?
Why the sheriff, who kinda figured out everything at the end and obviously worked years to try to prove both guys role was so comfortable that "Ray won't come back", seemed like he doesn't care if Norman was involved with the brothers disappearance/suspected murder?
So at the end all we see is both Norman, Francis were somewhat mentally crazy and the only person who actually was feeling normal (guilty and eaten inside during the time) was Ray.
Interesting plot at the end, but I think it would have been more interesting if Francis finishes what his father couldn't and than we see Norman covering another murder -his own brother's- or a Tarantino style finish, Norman in anger kills Francis too and than he shots himself too (and maybe before Francis kills daddy too).
Overall not a bad film, a sad but acceptable ending, although it would have been nice to see in 2-3 mins how things evolved after that.