DoT Mesmer: In layman's terms, slow down the enemy so they can't catch you, then pile on the degeneration while running away like a sissy!

I've compiled [but not played/tested] a mesmer necromancer build to do exactly that. Question is, is it that effective for pvp as well as pve? I've never come across one of these mesmers in any of the betas before, ever... I'm talking since last year's halloween beta, that's when I jumped on GW ^_^
Also, the other builds listed in that strategy guide. Though by now, I'm sure that guide needs a major update since "silence" isn't really a status effect [replaced by daze]
How useful do you think that strategy guide is?