I tend to be great at games like Scrabble and Words with Friends. I consider it a mark of pride that I don't just spew random letters across the board in the latter game just to see what works and what doesn't. I'm not bad at trivia based games either.
In the Xbox 360 days, I was really good at Worms, and had a much higher win ratio than just about any other multiplayer game I've ever played. Some of the later versions have been harder for me to play thanks to smaller icons for the weapons, but that's okay. I had my moment for bragging rights.
I don't know if this qualifies as being "good" at them or if I'm just crazy for putting up with the anime bullshit, but I've managed to get deep into every Disgaea game, to the point where I know I could hit top levels if I cared to grind out the end games to that point. Same with most RPGs with a focus on grind (see - most the PS1/PS2 era of RPGs). Like I say, though, this isn't all that difficult and more of a patience thing.
I’m going to name a bizarre one - Space Rangers 2. It was reviewed decently enough, but those reviews were mostly tucked away and forgotten about because it was such a niche release. But imagine Pirates! meets FTL... in 2006, no less. It was an insane game to be sure, but the fact that it was almost universally ignored was criminal.