I don't exactly feel like criticizing all the things mentioned in the original post, I would like to mention why, trying to stay clear of the fanboyism I already saw after a few posts... 
1. Yes, the encounter was somewhat abrupt, and yes, it is (probably) just a fetch quest. For me, the question is why they showed it in the demo? To show the mage-templar tension, they say. While I do not have any problem if one fetch quest looks such abrupt, I do feel to show the conflict, they could have chosen a much serious encounter, or at least made this one look a bit more serious if it was to end up in a demo.
2. More options is welcome, especially, as you mentioned later that saving the bear would have made things better from a role-playing perspective while playing as a Dalish elf, for example. Now, as it is a game, the question everyone would ask, and they already did, which one gives me what (XP)? And like everyone else, I'd also chose XP and loot over saving the poor animal.... unless, Bioware makes me pay for going after XP every time. And, I hear that in Inquisition, if you hunt wild animals too much, that may affect the world adversely. So, the developers have already taken care of the possible problem (I think). So even though the bear was killed, I think, that doesn't mean you can kill every wild animal without repercussions.
3. I'd just say that it has been already mentioned that Dragons are not necessarily a good thing in Thedas, even if they don't always interrupt you on your journey, like in Skyrim. That said, I would like to see some sort of 'real world' changes to point to the problems they may cause... that is, say, if you don't slay a certain Dragon during Act I (if it exists, like in DA2), then you find in Act II (if that exists, also) that the Dragon is wrecking havoc in an area. Just to give you some 'real' reasons to do the deed. But I think I heard in a demo/interview that being able to slay a Dragon gives you more power as the Inquisitor (no idea how exactly that would work in-game).
4. No, she didn't seem like she was physically tortured, and yes, like others said, she may have been tortured mentally. But wait, didn't that torturer take a sharp knife to hold it to her throat? Maybe that's just to threat her, maybe he was just warming up... we don't know how long she has been captive. Do I bother? From a visual perspective, some signs could have been there, from a gameplay perspective, not much to bother. But to me, it has nothing to do with 'mature' tag. You can show signs of even physical torture without getting a mature tag, I think. About killing the torturer, well, does an armor really make him death-proof? I doubt, and I'd like to say Bioware meant to show that Leliana could have killed him anytime, was just waiting for the Inquisitor to show up. About Leliana's attitude, I think I remember Mike clarifying in that same video why Leliana acted strange and how the Inquisitor's actions will affect the opinions of the companions. That may explain her being rude to her rescuers. Again, we are not aware of the whole scene.... I'd just give Leliana the benefit of doubt and think that it was a very poor choice the Inquisitor had made which caused her captivity. About the fight scene, there was an option to stop Leliana, we just saw one possibility, and I'd like to hope there were many others.
About not being able to control Leliana? She is not a follower this time round, and she goes on her own through cut-scenes... okay. Would I have loved it to be able to control her? Why not? 