Interesting perspective, and one that I think is much more applicable to Classic Who, which was made very differently than the '05 iteration. RTD's first era shook things up with its "companion first" approach and single-episode stories.
Some of the issues weren't exactly unique to DW, though. Star Trek: The Next Generation started in the late 80s, and its characters are largely cardboard cutouts, especially in the earlier years. Depth of character was very rare before the late 90s.
SirPatStew has shared the anecdote, but it's reportedly something that Roddenberry said.