I know where you're coming from Dobbles, its just poor terminology when people refer to a "true #1 d-man", when they actually mean elite/HOF quality. There are only about 3 active players that fit their criteria who are either elite offensively and very good defensively (or vice-versa) and if you're elite at both your name is Nick Lidstrom, Ray Bourque or Bobby Orr.
Kronwall is good to very good at both ends of the rink but is neither elite defensively (eg Chara, Webber) or elite offensively (eg Subban, Karlsson) to push him into that top-10. He's in that next group down in the 10-20 ranking.
What annoys me is people don't apply the same strict criteria to other positions. Where Crosby, Malkin and Stamkos are the only "true #1 centres" in the NHL.
I might be in the minority here, but I think Chara is one of the most overrated defensman in the league.