Blue is no doubt slower right now, but I don't mind it. It's nice not having to compete for camps. You're not going to be getting groups left & right, but plenty of groups can still be formed leading to smaller & more interesting compositions which I find more fun anyway. Never understood the appeal of always wanting full groups, which typically the xp is awful and nobody is really playing their class to its potential. Raid scene is still pretty active on Blue as well, so join a guild and make some more friends if you have the time.
As others have said, I'd say just pick a class that can do both solo/groups for flexibility. You could always just play green/teal when you want to be more social, and play blue when you want to explore more of Norrath. Playing a char on 2 different servers at the same time is allowed, so there's that too.
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