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They're OK. It depends what you're going for.
Some of them have decent free activities going on that anyone can join in, like gundam model building workshops that you can take the final product home with you, and also on-the-spot on stage 1 minute rush cosplay dressup competitions using things like toilet paper and streamers. Other examples include video game competitions, DDR, Smash, etc.
In terms of the crowds, I mean most people are pretty nice. Despite what /a/ likes to believe, there aren't that many landwhales and people don't actually go around shouting RASENGAN in the middle of the convention. Most people just stick to themselves while occasionally taking photos with a random cosplayer.
In terms of the quality of cosplays there, it obviously varies a shitload. Some people are lazy yet others go full out.