It did bother me, I do think it came a tad premature and I will miss them. That's The Walking Dead for you though.
Remember in the comics when they beheaded Tyrese out of nowhere? Or the random killing off of side characters from Hershel's farm? Or when they eliminated two thirds of the cast during the prison attack, including several lead characters? Sometimes The Walking Dead makes drastic but powerful decisions to sell Kirkman's pessimistic tone (which I don't agree with but understand).
I will say though. I think it will be more cathartic for the fans if it felt like Carley or Doug had a distinct influence on Lee in future episodes. We don't need their ghost to talk to Lee or anything, but make the loss feel like it shapes Lee differently than the other character. Maybe losing Carley builds Lee's moral core. Maybe losing Doug increases Lee's distrust. Just something that feels like they made a difference.
Don't post "Well you're asking too much since Telltale doesn't make your choices matter." They listen and sometimes it is good when they make controversial choices like this. I advocate they need to make it still count, but I don't mind that they did it. I had a feeling it was going to happen regardless, if not this episode than the next.
Now if someone could find a way to off Christa and Omid though...