I realized the same thing last night! I liked Keller when she was a background character, but they've moved her to the foreground and haven't done any extra work explaining who she is. She still feels like a background character, except now I'm supposed to care about her the same way I care about Team Sheppard, and I don't. I had the same problem with Carson and the way the show stepped up his involvement.
In contrast, SG-1 did a lot of work when they brought Jonas in to replace Daniel. Admittedly, I watched that on DVD, not live, but I loved Jonas and all the quirks they gave him. He really felt like part of the team. We knew the same kind of things about him that we knew about the rest of the team. Keller we know next to nothing about (nothing consistent at least). Even when Sheppard's background was a complete black hole, we still knew he liked Johnny Cash, surfboards, Batman, sparkly curtains, etc. When we saw Keller's room in "The Seed," all we saw was the light switch on the bedside table. Cadman's room got more set design and that was the first (and second to last) time we ever saw her. Though Keller is one up on Carson -- we never saw his room at all, until Rodney was packing it up after his death, and even then it mostly consisted of a framed promo shot from "Duet."
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In contrast, SG-1 did a lot of work when they brought Jonas in to replace Daniel. Admittedly, I watched that on DVD, not live, but I loved Jonas and all the quirks they gave him. He really felt like part of the team. We knew the same kind of things about him that we knew about the rest of the team. Keller we know next to nothing about (nothing consistent at least). Even when Sheppard's background was a complete black hole, we still knew he liked Johnny Cash, surfboards, Batman, sparkly curtains, etc. When we saw Keller's room in "The Seed," all we saw was the light switch on the bedside table. Cadman's room got more set design and that was the first (and second to last) time we ever saw her. Though Keller is one up on Carson -- we never saw his room at all, until Rodney was packing it up after his death, and even then it mostly consisted of a framed promo shot from "Duet."