Multiplayer/online game you think has gone unnoticed?

What's a multiplayer game you really like, really enjoy playing but it lacks a player base so you kind of have to play solo or lucky enough to have friends that play it with you?

I really enjoy MMORPGs and find that the player base for such genres tend to be a LOT higher on PC. Thats maybe due to the fact that these types of games are more optimised for PC. Personally, I want to say
TERA fits this. Or maybe it's just the EU servers? Places that used to be filled with players now have tumbleweeds flowing through. You say something in the chat and you get the crickets responding to you. All metaphorically of course. but
I have noticed that when I played this game last year, loading into a dungeon and finding players was SUPER easy and you'd almost always get put in one instantly. Now, I selected matchmaking yesterday and was in the queue for a good hour or two. I gave up
and never joined a dungeon that day. I used to always bump into players whilst exploring and I haven't come across anyone in a while. Its quite sad really.

For those who don't know what Tera is, Tera is an MMORPG (Massive Multiplayer Online Role Playing Game) and fits the fantasy genre also. You are able to choose from a range of races to play as and classes dependent on your play style. The game Is however
somewhat...provocative. The type where female characters are barely dressed and armoured lol. There's so much to do as a solo player. Quests. Stories. That kinda thing. I do recommend this game and would be great to see more players! If you're ever in need
of a healer to accompany you in the EU servers, Im a level 65 maxed priest Elin! GT:

:)