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One of the things TSW has been accused of is being a single player game disguised as an MMO. It's strange to me, because it has all the things you'd ask for in an MMO -- 8 dungeons (3 levels of difficulty), the NYC raid with another boss on the way, 8 open world lairs/bosses. General and LFG chat channels continuously have people asking to group up, and I've found myself talking to more people in game than I have in pretty much 4 years of other MMOs -- maybe credit that to some nice folks in the community. Lots of people running around doing action quests in pairs or as teams. You can group across servers.
It's got to be the investigation and sabotage quests as well as the single-player story instances in the game. Which, while there are quite a few of them early on in Kingsmouth, really thin out as you progress. I don't mind the solo instances myself; those can be played when grouping isn't an option or when you just want to sit down Myst-like with some coffee to figure out a tricky puzzle. I also enjoy some of the challenge fighting something solo from time to time, and some of the solo instances are genuinely creepy. I find that for the story, I like to be completley focused on what's happening without the distractions of a group.
Is this a bad thing? Does having solo stuff alongside the multiplayer aspects make it a "single player" game?