This was to me a jump in the past, I've started with Poloniex as my first trading platform, and stuck with it until the BTC bull run, when I had my coins moved there due to a lot of promising features. Indeed, Poloniex support is sh*t, and in 2017, it was within top 10 exchanges, if you were looking at reviews. I had no problems with Poloniex, I still have some weak coin leftovers there, which I haven't checked on, since the bear market. Will intend to log in soon, and check what Circle has done with their acquisition.