It’s not that great, but it’s only 2 Build. It’s insurance for your existing defenses.
Consider the following:
1) We do not know how common Bane will be for NPCs in 2.0, only how common it will be for PCs.
2) 2.0 Rogues will be susceptible to Banes vs Command, Curse, Eldritch Force, and Binding, just from their per-day weapon skills. Add all the things that Trap and Alchemy Globes can deliver.
3) Counteract is insurance for your Dodges and Evades (and possibly Racials). So the value of the skill is going to be primarily dependent on how often your per-days are returned. But if you use a 2 build skill instead of a 4+ build skill? That’s profit.
So I like Counteract, but I wouldn’t invest too much in them, at least not until we see how prevalent Bane becomes. Also, I think it’s pretty useful in killing mages or negating Retribution, so it has some serious PvP value.