Terrible! I have eaten there before and it was decent but my recent visit marked a new low for me. The waitstaff was completely clueless and we waited an hour and a half because the  kitchen was backed up. I've worked in a lot of restaurants and am extremely patient when it comes to things like this, but they serve burgers and sandwiches mostly, so with 10 tables in the whole place I don't understand how it can be backed up.
They ran out of their signature drink and every tap beer except one. How does a bar run out of beer and liquor?
Our waiter never came back to get us more drinks and when he did, he took food that people were still eating and left before we could say anything.
Yeah, the view on the water is great. That's about it. Don't waste your time or $$$$
Our annual trip to Minocqua always includes a dinner and/or stop at the Thirsty Whale. The fish fry is very good and my son loved the baby corn dogs. It's fun to watch the water ski show from the deck as you enjoy a drink or wait for your table. While the wait on a Friday is long in the summer (we waited almost 2 hours), we spent the time watching the ski show and the kids played in the game room.
We also stopped here late Wednesday night (11pm). It was pretty dead but we got great service and spent time chatting with the bartenders and hearing local stories.