Torian's romance is, just like the rest of his story, not comparable to Mako's.
Where Mako's storyline involved going to Nar Shaddaa and other places to investigate, Torian's was just the player giving (or not giving) him permission to go out bounty-hunting with his friends for the duration of a couple of fades-to-black.
So there's flirting, a kiss, and finally a proposal. Nothing special, but it would have been a whole lot better if the rest of his story actually had some substance. If I were to hazard a guess, I'd say it's because the writer had no idea how to actually do an interesting romance story with a man as the love interest.
That's how Andy's was. Is it that way with all non-first companions?