I voted yes...
BUT...I'd also like an 'ew' or 'ugh' as has been discussed elsewhere...
The situation I find myself in most often where I find the current selection inadequate is where someone has done a good job of responding to my post, even though it may be clear that there's not much need for further discussion...an 'agree to disagree' sort of situation...traditionally I give it a like, and it's not a funny, winner, informative, or etc.
An interesting rating might be a better fit for that...
Agree will likely replace a lot of my likes...or they're interchangeable...