Well, I do prefer "nice but dim" to clever and nasty. Though obviously clever and nice is the ideal combination. I do quite like Helen though; she is an idiot, but I don't see much harm in her.
I prefer people who don't try and play up to any one particular persona, myself. But as for "nice but dim", I'm just irritated that it is seen as THE thing to aspire to be by media types. What happened to people just being themselves? Why on earth is being "dim" considered an endearing thing?
Then again, Helen might be one of the few who isn't putting on an act. She seems harmless, I agree, but it's worrying someone her age would be so clueless about the world around her. Parenting fail?