Good to know. I've never been to a Morton's and now I know to avoid. I am not that big on expensive steakhouses. I mostly go to the seafood places - Landry's once, McCormick & Schmidt, Bubba Gumps, once to some dinosaur restaurant at Disney I took my kids to, and Rainforest Cafe if I have a birthday reward to burn and no better option. Every place I've tried has been decent (if overpriced in the case of the gimmicky dinosaur/rainforest places), except Mitchell's Fish Market which was kind of bad.
Yes there's some Golden Nugget places the card is good at but I haven't used at any. IIRC on one Vegas trip I had planned to go to Claim Jumper at the Golden Nugget for a meal but ended up doing something else.