Free RPG - Symbaroum Corebook free until Thursday Jan. 30
It's very dark fantasy, so it certainly can be depressing. Probably one of the best things about it from my POV is that the setting is clearly written and designed to be easy to game in. Plot hooks abound, and they do a great job of clearly presenting different angles and opportunities for characters to insert themselves into the world even if you don't want to follow the written story adventures.
I will add that much of the setting material is gradually unveiled in later releases, which can be a bit frustrating at times. On the other hand, I've never felt like I wasted my money buying the sourcebooks and/or adventures.
I haven't played with the actual mechanics so I can't comment on them beyond saying they look reasonable from what I've read. I would be happy to run this game for newcomers to gaming in lieu of D&D, personally. I think the mechanics are more straightforward and it has a lot of setting material that is easy to understand and accessible. Admittedly, I mostly use the setting for a Blade of the Iron Throne campaign I'm running.
All that said, it was free, so there was really no reason not to download it. =)