I like the Rory/Logan story arc. I think it's great that she's enjoying college life more now than in other seasons. Marty is nice, but he's a Dean, someone you settle down with. Logan is exciting and that's what Rory needs.
I can't wait till next weeks episode since they're going to deal with Lorelai and Emily's estrangement. It will be interesting to see the interaction between Luke and Emily, especially since she will be on his turf.
There's a real good article about GG in last weeks Entertainment Weekly. Amy Sherman Palladino said that she's always had the entire series planned out and even knows how the last episode will end.