I’m best at games that let me cheat...

I'm really good at RPG's (I always finish them, to the bitter end), puzzle games (Provided I am given proper time, I hate being rushed) and I have my fair share of platformers on which I used to excel, not sure that I still do as I don't play much of those games these days.

Rollercoaster Tycoon 2.

Halo. Reach, specifically. I was a monster. I've never played anyone local and lost. Online, even though my stats don't reflect it because I would put my controller down and walk away out of boredom, I was disgusting. Next would be No Mercy for 64. Those 2 were my bread and butter.
I can hold my own in DoA (2-6) but I need to hone my skills.
Right now, I'm trying to get good at Mario Maker 2. I would love to make some money on YouTube. I can do most kaizo tricks but again, I need to hone my skills.

Chess

Maybe Dark Souls 3

Although I've played my fair share of traditional turn-based jpg's in my day, I'd be lying to myself if I said if that genre of games required skill.
I will also make the obvious argument that the more you play a game, the better you get at it. In my case it was games I played a lot and got good at unintentionally. As a matter of fact, any game I tried to get intentionally "good" at never saw success. Street Fighter is a good example. As much as I played SFIV, I could never compete with the pros.

My list:
Mega Man X series: I played them so much I could sometimes finish them without taking damage
.
Resident Evil 2 & 3 for PS1: If youtube was a thing back in the day I would probably be a top speed runner

Dance Dance Revolution: I never realized how good I was until I was at a mall late 2000's with a few of my siblings and my nephews. My nephews quartered-up on a DDR arcade machine, and I made jaws drop that day. Truth be told, I used DDR to stay fit as I was bit chubby and out of shape. I hated exercising but loved video games. I figured if it was a game I wouldn't get bored. DDR was a lifestyle until about 2013. Would play it 2 hours each night before bed. I got extremely good because I played it religiously for about 5 years. It was the healthiest 5 years of my life.

MGSIV: I completed the game so many times that I could effortlessly finish the game without a single kill in under 2 hours. The big mama motorcycle level was the only thing that truly challenged me.

I like this thread.

I was a monster at Gears 1 back in the day. 1v4's were quite doable if the other team wasn't up to scratch.

Before the internet, I was the single greatest Street Fighter 2 player on the planet. Boy am I humbled, now!

Fighting games in general (outside Smash). Consider myself top tier Tekken and Street Fighter player (not Pro level), can definitely hold my own.

Hmm sorry. I cant remember much from my dota days at all, I practically didnt play any Dota 2 and after 2006 or so I was fully focused on 1on1 and 2on2.. I might have played S4, I have heard from a friend that we did play someone from Alliance at some point. But no names. Dota was always the sidetrack compared to regular WC3.