There's a lot of OSR adventures that are better at being spooky than "Nu-Ravenloft". Here I talk about some of them!
Meanwhile, if you want pure Gothic stuff, Daniel James Hanley's Ghastly Affair work goes straight back to the sources and translates them to the OSR.
OSR products that I would recommend:
Games
Beyond the Wall (and especially its companion volume Further Afield) my personal favourite
The Sword & Sorcery sister game to the above: Through Sunken Lands my new shiny favourite
Dungeon Crawl Classicsfor the funnel and the craziness
Old School Essentials for the nostaliga and ease of use plus the expansions
Dragon Warriors (and the adventures Sleeping Gods and Elven Crystals)- my favourit e alternative to D&D redux
Settings
Second the Gazeteers of the Known World especially Karameikos, Glantri and Rockhome
Midderlands for the detail and the creepy oddness
Dolmenwood for the fairy-tale feel
Scenarios[/u] (including only the ones I have run on more than one occasion)
Necropolis of Nuromen (really old school feel)
The Keep on the Borderlands (of course)
Shadowbrook Manor (lots of deadly fun)
The Stygian Garden of Abelia Prim (truly original and excellent)
The Gardens of Ynn (great ideas)
Grave of the Heartless