Every modern MMO is pretty much solo with people around. I'd say this is especially true for ESO. There's essentially no reason to socialize from what I recall, but I never made it to end-game. I prefer the FFXIV design where you can play solo if you want, but there's also reasons to socialize if you want to. It's much more interesting to hang out in. In ESO, from what I remember, I never felt like hanging out and only played to complete content.