I enjoyed it immensely. Don't forget that during the last story quest we were ready to leave everyone behind and leave the damn place together with our sibling. I kinda like that attitude of our MC.
Tart is likable because he's unlikable. That dude is just annoying. He never shuts up and laughs for no reason all the time. Definitely a comfort character for many girls, but I feel really irritated by his constant presence and the fact that I can't move on without him being involved.
Oh I don't dislike it, I just wish that we could stick with it instead of saying "I'm not here to get in the middle of your shit" but then 2 sentences later be like "oh ok I'll help after all". I wish there was an honest 2 paths we could take, like friendly/asshole. The downside is that even though we have dialogue choices, they're all the same in the end and give you no actual freedom on how you want to approach the story.
Totally agree about Tohma, I dislike him a lot. He'd only be a good character if later on we find out he was actually a villain.
Speaking of, I hope we get more morally grey characters soon. I've said it before, but I'm really getting tired of the "hardworking workaholic good guy" types. Tart was interesting to me because he wasn't that type at all. We need the squinty villain type that when he/she opens their eyes then you know shit is about to get real.