Although I did not watch a lot of the series, I must give ENT an F.
Character growth and development was a product of dialog, not demonstration (e.g. there was dialog about Archer being a great diplomat, but he let his dog run roughshod over the cultural taboos of a society).
Despite all that, I won't attack anyone for liking what I found to be a horrible series. What you like is what you like. I'm sure that I like some stuff that other people think is crap. In fact, I probably pride myself on that!
Same here, about not attacking anyone. There's plenty of people who like things I hate and hate things I like.
For my two cents, character growth and development was pretty good, not great, but good. Archer started the series harboring a deep, deep resentment of the Vulcans. After experiencing that they weren't all arrogant jerks (especially his relationships with T'Pol and T'Pau), he came to have a much more warm and open opinion about them. And I like how they showed him letting Porthos run crazy. It showed how his diplomatic skills evolved. He didn't just start off as a great diplomat; he learned on the job. T'Pol definitely changed, from someone who consistently toed the government line to one willing to help overthrow the High Command.
Granted, the growth wasn't as in depth and fleshed out as DS9 characters, but it was most definitely more developed than TNG characters. With the exception of Worf, did any of them change?
Anyways, that's my opinion and I'm stickin' to it.