I actually love his voice and to me it's deep enough. So calm and comforting...
I didn't watch the full stream, I left out the moment when we first see him and heard just a few sentences that didn't spoil much for me.
So whatever I'm saying now is not linked to anything I heard him say.
About his hidden agenda: I find it hard to believe he learned so much on his own, being just a 'hedge mage'. He's very intelligent, yes, so he could learn a lot by himself, but maybe he's not entirely honest about who he really is. (although I base this only on a character interview with PW from a few months ago).
It's hard not to believe him, because he's so adorable and sweet, one smile and he won my heart. (Damn you Solas, don't be so cute and stop moving your head like that)
Did anyone else notice how he's moving his head to the sides, whenever he listens to someone or talks? It's super cute 
About Inquisitor voices: I like Alix' voice (despite it sounding too much like Samantha Traynor) but Sumalee.. .I don't know, she's talking too slowly, there are no emotions. I don't want to sound mean, but I hated her voice acting so far.
Hopefully it gets better later.
(Edited for mistakes)