I've been a few times and really wanted to like it, but just didn't. The oysters are too doctored up with spice to really savor the great flavor. I did try frog legs for the first time there.
If oysters are what you seek, I can point you in better directions if you so wish.
Best oyster I've had in Portland was at South Park Seafood restaurant. Great place. A little on the spendy side. They serve their oysters with this cold icy mint. To die for.
Bar Avignon is a great place with high quality oysters. They usually have 3 or 4 varieties but they. Change frequently. Great place all around, I've never had a bad dish there. And they have one bartender chick whose awesome in every way, but she's married.