I can't help but disagree with this post nearly entirely. As I see it, Afflictionists can, at many points during their talent setup, opt for a way to increase their damage or add to their toolbox of tricks. For example, do you want Eradication for damage, or Improved Howl of Terror? Would you care for Improved Fear or Fel Concentration, or would you rather Improved Curse of Agony? And in effect, isn't this creating the exact kind of decision-making talent trees were designed to do?
Personally, as the idea of raiding as an Affliction Warlock sends shivers down my spine the likes of which I've never felt, I would probably go for this talent setup. Please realise that the single point in Devastation is because that is going to be the single point in Ruin. This is also presuming that another Warlock will spec Malediction and fill in the Curse of Elements place.
Painful as it is to lose Fel Concentration, I feel that it isn't as necessary in many raiding situations as, say, Everlasting Affliction and you can grab it by respeccing talent points out of Suppression when your gear hits the spell hit cap, and potentially Improved Curse of Agony if you feel strongly about it's damage per second upgrade. Overall, though, I think this is one of the most considered builds when Afflictionists turn their eye to pure damage.