NH definitely get more of a storyline. It's controversial as to whether it's a better storyline. I liked the S2 story arc for NH for the most part (unpopular opinion) but that's probably because I didn't watch in in real time. I started watching live around 305 or 306 so the NH reunion wasn't drawn out for me. Haley's my favorite character so I didn't like her off screen/with limited screen time for some of the eps in s2 but I could fast forward stuff that wasn't interesting to me and get through the filler eps pretty quickly.
Yeah that part makes no sense at all. So because she's never done anything hasty in her life up to this point, we should let her marry as a teenager?!?! I think that's part of why I did like that they had Haley backing out of the marriage in s2, I think she never expected her parents to say yes and then she was a little like wait, wha? I guess I'm just trying to say I don't think it's unrealistic for a 16 year old to maybe have second thoughts re marrying someone so young. She was totally vilified for it by the crazy tweener fans though. Looking back, if this show had been run by more competent people, I think it would have been interesting to split them up for more time and then have them come back together later but that probably would have ruined them for me since the writers for this show couldn't have split them up without going for the easy third party storylines. Especially since they could barely stay away from those stories even though they kept NH married.
It is strangely addicting! I haven't watched a full on ep in awhile (and frankly I could probably only watch a season 1 ep all the way through at this point) but will watch clips every so often even though the show ended awhile ago.