I decide whether I like or dislike someone after I get to know them lol Before that, every characters are in the "interesting" category, with some ranks a bit higher than others xD
That being said, I like the companions that we've known so far. They are all interesting in their own way. If they are what I think they are, I'm pretty sure I will love them all, as in the case of Origins' companions

On a side note, to me, Tallis and Sebastian, are quite possibly the worst companions BioWare came up with. I hated Anders with a burning passion, but at least that crazy mofo has character, those 2 are just plain colorless and boring. Tallis is a typical Mary Sue, flawless in the boring, shallow, fan fiction kind of way. Giving her a whole dlc is pretty much just an advertising move, using Felicia Day's popularity. Seb is just a stick in the mud, who can't do anything but preach (revenge his family? Nope. Reclaim his city? Nope. Avenge his "oh I will protect you with my life" Elthina? Nope. WTF are you even doing here?). All he did was talk and talk and talk, and be the "prince charming" for the ladies to swoon over (seriously????). If you paid $7 to get him, I'm so sorry for your loss.
Sure hope they will come up with better characters than those 2 in future games.