I definitely did not guess we was holding a bane. I remember hesitating on that turn, but it wasn't that hard a decision.
-2 estates, +1 silver, +1 tunnel definitely beats giving a curse and maybe picking up a tunnel
On the more general question on killing two cards vs giving one curse, I think i would take killing two cards almost every time.
Say you somehow drew:
Hag, remake, cursex3
I think remaking the curses would be better than playing the hag. But it would depend on where the deck cycles were, the size of the curse pile, and a few other considerations.
The reason hag generally beats remake as an open is as WW described; if you could guarantee rm would line up with 2 estates and/or curses everytime it came up, it would likely beat hag, but that's not going to happen.
I played a game earlier today where I ignored the hag due to what I thought was an effective trashing option (remake and trading post I think on a 3/4 open). I didn't work, but it was damn close (my opponent made a comment, something along the lines of, "I'm actually rooting for you with that strategy"). The log isn't up on cr yet, but I will look for it tomorrow.
Ed