Friday the 13th - 6.5/10
Started my marathon off with the original. It'd been years since seeing this film and to my surprise it's probably the one I enjoyed the most of the first 4 films. Sure Jason isn't the killer here but the setting and mood are far and away the best of the series and it actually has a nice element of mystery to it with a classic shocking climax.
Friday the 13th Part 2 - 6/10
Pretty decent follow up to the original. Of course the biggest deal here is the introduction of an adult Jason as the unstoppable killer. The return to the camp setting is welcome, something I think hurts the subsequent sequels.
Friday the 13th Part 3 - 4/10
Things start to go off the rails with the third entry. Outside of Jason getting his trademark hockey mask and his supposed death at the end, not much is notable here. It's totally cliche and as one of the first 3D films of the 80's there's an over reliance on gimmicky effects which stick out like a sore thumb.
Friday the 13th The Final Chapter - 5.5/10
I seem to remember liking this one more. Upon revisiting it there are some cool elements with the introduction of Tommy but the supporting cast of clueless oversexed teenagers is downright awful. The setting isn't all that great either as more emphasis should have been placed on the Crystal Lake setting. Instead it's all but an afterthought. Until the showdown with Tommy V Jason at the end it's very by the numbers.