""go play on other servers", that logic alone makes no sense is just gate keeping."
Except it's not. People are trying to help. There are a number of different CoH servers with different goals, and people are trying to inform you that your suggestion runs contrary to this server's mission statement for the most part, and that you might have more fun on one of the servers that better aligns with your sensibilities.
Now we can argue whether or not they're doing so properly, or what-have-you, but accusing everyone who's trying to point this out of gatekeeping is not making a good impression, as multiple people have already told you.
Back to the topic at hand: I think the XP curve is generally fine, as a fellow new player. I did my first iTrials on this server, to give you an idea how baby I was to the game prior. Maybe the level 40-50 grind is a tad slow for my tastes sometimes, but people are generally receptive if you call you're running portal missions, and if I keep an eye on #in-game-lfg I can usually find a level 50 tip group or fire farm if I want it, and if I can't I've built rapport with enough people to usually be able to make a group when I want one.
CoH is far and away my favorite MMO, and I would not want the sensibilities that make me like other MMOs less to come here. As I learn more and more about the server, I realize how many systems they've made to accomodate us players. I could argue, because I had some onboarding issues as a new player, that things could be done to educate new players about what those things are, but if you play here long enough, unless you're me and make too many alts, you'll end up with more XP boosters than you can reasonably spend.
If your problem is finding groups, there are systems for that that have already been pointed out to you. If your problem is finding solo XP too low, the server hands you boosters. If that's not enough, then you legitimately might be happier on a server with sensibilities like yours.