Totally love it. I come from Europe and I always had an IKEA nearby. Love their meatballs with meat sauce + jam. It is also really cheap for what the serve!
Besides the meatballs you can get other Swedish/ European food like salmon, pies, salads... and some Korean fusion food like bulgogi. You can also get cakes for dessert.
There are 2 places to eat in IKEA. The first one is the big canteen, and the other one is a small stall outside of the cash area, which only sells hotdogs and other snacks (really really cheap as well).
Next to the cash area you will also find a supermarket where you can buy their prepared food (including their meatballs! :D), cookies, drinks, chocolates...
Beware of lines on weekends!