I think I agree with you about the holes in the plot, especially with the Smith and Jones episode, I think the loss of Billie Piper flumuxed the writers a little bit.
If Rose was still in it, The Doctor would be falling in love with his true love, rather than some soppy stranger he has just met in a hospital... like a few days after losing Rose - but to be fair - she is fit, and i wouldn't say no!
I know its not exactly a love story, but all Martha seems to do - is chase The Doctors' cock, which he insists he wants nothing to do with it.
The story hasn't centered around this plot for a few episodes in this series, but the first few were beginning to get quite soppy for me, and if it was towards the Rose character I would have accepted it a bit... but thats my only gripe at the moment.
But strangly, I do prefer episodes where the doctor isn't in it as much, Blink was a good episode, it reminded me a bit of Love & Monsters from series two, featuring Marc Warren and Peter Kay.
I prefer it where The Doctor is more mystrious, as sometimes I dont want to understand everything that is going on about him. Thats why I quite like that Captain Jack fella, is he a goody, a baddy, is he charming, or just perverted? I like the thought of The Doctor having a dark side, the idea that everywhere he goes, theres trouble, he is a walking disaster...
I prefer the episodes where it evolves around character effected by The Doctor and time travel... but thats just me.
I do enjoy watching them.