I have been to Olive Garden many times, the Wausau one probably three times. Only lunches. It's nothing great, just a place to go and get something to eat... nothing special about it. I'm always surprised by the people that rate an Olive Garden 5 stars. Really? There are much better restaurants in the Wausau area that give you a lot more (better food, better service, better drinks, better atmosphere) for the same price.
If you're in the Wausau area and looking for good Italian food, do yourself a favor and drive the extra two miles to Carmelo's or get on the highway and go to Iozzo's. They are both locally owned and are 100x better.