I too liked the quests, yes. But his character was so fickle for my taste, which made me not care about him. Hell, I would've love to have killed him on the spot after Ander's did what he did.
But, this is not the right place to discuss this. We better get back on topic 
Man, it's been refreshing to have something new to talk about around here, isn't it? If you're curious about my thoughts on Seb, send me a PM and I'll link my post about him.
Anyhow, I've been bouncing around ideas about the new trees. If there is companion-only trees again (like in DA2,) what do you think some of these guys would be?
If (and a giant If) they do something like that again, these would be my ideas. I'm just having fun with the topic.
- Solas: A tree with a mix of Tevinter and Dalish magic. I pictured him easily as a healer that also has a lot of crowd control.
- "Sera": I suspect she'll be our archer that was mentioned in the German magazine. I completely see her as a rogue.
- "Cullen"/Possible Templar: Obvious
- "Hot Daddy" Grey Warden: I would go with a 2H warrior with good stuns.
- Cassandra: Reminds me of Aveline, in a really good way. Sword and board for her. Similar to Aveline's.
- Vivienne: DPS mage. Perhaps a mix of entropy and elemental?
- Iron Bull: He's been confirmed to be a mercenary, so I've thought he might be our dual-wielding rogue.
Please don't take me as stating anything as fact. This is sheer conjecture and opinion, unless other wise noted. Also, don't take it as "This is what I want from the game." It's just what's come to mind over time.