I definitely have to agree with you. In general, Oblivion felt more alive. Yeah, I know, that's probably not the popular opinion, but it's my opinion.
I can't really put my finger on what it was...maybe it was the addition of NPC disposition? It may've been shallow, but for me it added a lot. It truly gave the illusion of making ties with citizens.
It also helped that you could talk to every single NPC. They wouldn't just spew some random message. In Skyrim, certain NPC's don't have a function beyond saying one line of dialogue, over and over. In addition to that, I felt like the interactions between NPC's in Oblivion was much better than in Skyrim. I haven't forgotten about the random, sporadic, non-sensical conversations that could occur. To be quite truthful, I think they added charm.
PLEASE DON'T GET ME STARTED ON GURADS... to late... The guards in Skyrim svck, they are pointless. In oblivion and past games they gave you directions, rumors and other things, in skyrim they give lame one liners and are just annoying.
and another thign while talking about Skyrim not being alive, I can't really remember random citizens talking to eachother randomly in Skyrim, not sure why I can't remember it but I do remember them doing it in Oblivion, jsut walking and than hear one say "I was walking down by the river last night and saw a mudcrab, I got out of there as quick as I could" and the other replied "Oh I stay as far away from those monsters as I can" and it felt alive but in Skyrim I can't remember that happening, I remember one lines being spewed out at me which got annoying when trying to mine or just admiring the mists rolling over the mountains in Whiterun...