Having been to Sushi/Chinese buffets in the GTA Wasabi is probably one of the better chinese style cooking and variety in food. The sushi is another story with not as many special rolls and not all types of sashimi.
You do have to get up to retrieve your own food, which is good because you can select how much, how cooked and what you want instead of asking the server 10 questions about each dish.
The restaurant is also HUGE, good for parties and get togethers where everyone will find something they like.
The chinese food includes a noodle soup bar, seafood, and a range of chinese staples plus japanese dishes including teriyaki, tempura, yakitori.
Dessert is nothing "special" has more variety then most.
But overall the problem is Wasabi doesn't do Japanese great or Chinese above par, both are just passable. If they focused on just one, their quality could beat quantity.
Overall the price of $25 before tax and tips could do more damage with some change left over at Prince Sushi across the plaza.