I had some problems with certain characters. I didn't like the way Robin Lefler was written and couldn't imagine it being the same character, even though she was only in 2 Next Gen episodes.
I didn't realize it until I reread them a few years ago, but up until 'After The Fall,' I really agree with this statement - PD's characterization of Robin doesn't sit well up until recently. Personally, I think it's the fact that she almostly instantly becomes smitten with Si Cwan and most of her thoughts and characterization seem to revolve around him -now that he's been removed from the equation, she's got a little more personality because she has to develop without him. Now, if her child becomes the entire universe to her, again I'm going to have a problem with her.
It's one of the reasons I like the fanseries Hidden Frontier's take on the character, since she's got a character separate from someone else.
I think the problem is that Peter David gave her character what I like to think of as "the Edge", as he gives all his characters. This isn't to suggest Peter David writes bad characters- far from it- but they do all have the Edge. I'm reminded of Terry Pratchet's Discworld books, where every female character has the Edge (and quite a pronounded Edge it is), because Pratchet by his own admission can't write "soft" female characters. This means his male characters tend to be varied and complex, while his female ones all come from the same cookie cutter. As fascinating as Peter David's take on his characters (either his own or TV-borrowed) is, Lefler on TV simply did not possess the Edge and so when written by David she comes across differently. Contrast Shelby, who did have the Edge and thus is written truthfully and well by Peter David.