The obvious disadvantage is that this group play is asynchronous, once you made your move you need to wait for the other group members to move to continue. To avoid waiting forever, there is an auto-move after 24 hours. Still you tend to get only a few rounds of combat done per day, so this isn't a game for the impatient.
The interface might look a bit strange on the PC, but that is because it is designed to also run on mobile devices. Works perfectly on an iPad, I tested that. Joining a group of strangers is easy enough. And if you want more, you can play in parallel with several characters. Nice, I like it!

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