Would Horizontal Progression Help this Game?

[Kaurie]

I've never played this game before but I've been told that Guild Wars 2 has Horizontal progression and it works out pretty well. I can't verify this though as I've never played the game myself but if it's true then the formula can still work in modern MMORPG's it would seem.

I was going to say that most games that I have played which incorporated Horizontal Progression have had reasonable success, with the notable exception of Guild Wars 2 :|