I'm fine with it as long as you have the choice NOT to take them. I don't want another Merrill and Anders foisted on me.
I feel the same way about Oghren. I didn't hate him, but I really didn't like him very much at first. In a game where the team had taken great pains to make their dwarves different, in walks in a stereotype so bad, he was only missing the Scottish accent. I barely used him, since I had Sten if I wanted a 2H warrior to bomb around with. Yes, I know you can "kill" or "dismiss" him in Origins. I did neither, because he didn't irk me that severely.
However, I was very unhappy with him returning in Awakening. Bad enough he didn't know me, but his drinking was played for laughs and I found it sad. Awakening rewound his character growth and made me start all over again. Anders? You can hand him back to the templars. Nate? Execute him. Sigrun? I think there is an option to tell her to get bent too, though I'm not sure. Yet, I'm forced to deal with Oghren, who's a total drunken wreck and threw away the relationship my Cousland Warden set up for him. The third time he fell over drunk in a 11 hour game, I wasn't laughing anymore. 
Dear Dragon Age Team: I love your games, very much. I'm reading Asunder now and so far it's pretty good. However, please don't make alcoholism a focus of humor for a character? It's not funny, it's pathetic and sad to watch a full grown man (dwarf) dive into the bottom of a bottle because he cannot handle life. I know you were trying to say that his drinking was a result of his pain, but more often than not, I could hear a laugh track in my mind. I didn't think the pony comment was amusing, it just seemed like drunken ugliness.
More on topic, I haven't found a character yet I wanted to "throttle." Some I thought were pathetic (Oghren,) some were extremely caustic (Morrigan) and others were rather sullen (Sten.) I didn't hate any of them though, which is a good sign for me in the future. Besides, my solution to a companion I don't like? Leave them at camp/home and just ignore them.
On a final note, David Gaider has already stated that you can dismiss companions, and I think he said you could choose not to recruit them as well. They'll probably be a couple of "But Thou Must!" companions that we'll have to take. My guess is the group from PAX. I can safely say Varric is going to be one (based on PAX footage and on DA2,) and I'd guess the two ladies might be the same way (Vivienne and Cassandra.)