A recent study found some links between intelligence and results in video games. Intelligence has more influence on the success in MOBAs than in a shooter though. Age is relevant for success in a shooter game, as reaction tends to reduce.

i hate strategy games but im good at them. does that mean i hate myself..?

Not a surprise. After all, my IQ of 200 isn't shocking considering how I play demanding games such as 'Brain Age' with ease

Ah, I'm generally terrible at games, I guess that means I'm not very smart

Oh here we go with the age thing again. If age was that important, I wouldn't have such a high KD ratio in COD and Halo (I'm 38). As for intelligence, I could see that actually having an impact due to problem solving etc. 

It makes sense. Being successful at games depend on the player having a strategy of some kind.

Another point is that every intelligent gamer I've known is really good at gaming, even if they rarely play games; while average people tend to fare worse. I can't even think of an exception.

I consider myself completely average at videogames, sure i've completed some games on the hardest difficulty but thats because of trial and error through repitition.

I mean, you'll generally find people who are among the best at something tend to be pretty darn intelligent for obvious reasons. I see no reason why games, which don't even really require any athleticism, would somehow be any different.

This is true expecially the more challenging the game is. Different types of games suit different forms of intelligence, such as stratetgy/puzzle games testing logic, detective games test analysing skills, simulation tests organization, a tricky stealth game would test spacial awareness, quiz games test knowledge, a complex environment or maze tests memory, FPS and action games will test speed and muscle-memory.
If its a fps set in a maze it would test both speed and memory. An average Modern AAA game usually a mix of mutiple genres and have a varied ammount of different intelligences throughout a single game. Also the higher the difficulty the more intellegent the player needs to be in the particular area/s of testing.

I'd be cautious on trusting studies like these blindly - the study of humans is always a very vague topic. You will often find research showing a statement and other showing the contrary - scientific consensus takes more than a single study, in the domain, and judgment should be reserved until it is met. I could, for example, very well imagine that video games can serve to efficiently train to the standard tests used to determine intelligence (and yes, those can be trained), rather than truly elevating or serving as an indicator of global intellectual capabilities.