LOL! I have 1800 hours in dota2. Probably even more than that in the original DotA WC3 mod.
I think at this point I'm pretty much too old to be much better than I am, I just don't have the reflexes and hand/eye to compete with the kids.
My goal for myself is to get to 4k MMR. I feel like there are so many noobs in the 3.5k range that I can't possibly be this bad. But at the same time, the stupid matchmaker refuses to let me out, by giving me people that do such insanely noobly shit that there is no way it is working as intended.
At least, many, many people exist in 3.5k that have zero idea how teams can/should work together, or even how to win. And they all think that K/D/A is the only thing that matters, which again is partly why they are so terrible.
Go ahead, tell your support he sucks because he has died 5 times. Ignore the fact that he was saving your stupid ass each time, and you were way out of position where you had no business being.