I am not going to lean one way or the other towards Eradicate being overpowered, I am rather going to argue against the entire dispel system.
As has already been stated, the standard dispel rate is 5s CD/per buff stripped. Many buffs that are exceptionally long duration (the "Blade" enchants that Nightblades get, for example) are currently dispellable. This includes other things, such as Lifegiving Veil and Meins, which actually make souls "work" in the first place. The current rule of 5s CD per buff stripped is way too strong against these "soul-defining" abilities.
On the other hand, we have rapidly applied buffs, such as a Warden's HoTs, where the 5s CD/per buff stripped is probably not good enough, and may be more reasonable at a 2-4 second CD/per buff stripped instead.
So we have two conflicting points here. I think two things need to happen: Eradicate should be brought in line with other dispels (for now) and that long duration, soul-defining buffs should no longer be subject to dispels. Once both of these things are done, it would be easier to discuss if dispels need a buff or not.
Ultimately, dispelling needs to be a tactical decision, as every ability should be in a healthy PvP environment. When a player sees a Templar, Justicar, or Chloromancer, it should not necessarily be instinctive to just start spamming the dispel button. That is what is happening right now, because the benefits of pressing your dispel button vastly outweigh any other action you could be performing on those targets.