This is the best Walmart I've been too. It could just be the area but I find that they always have a lot of cashiers working and managers to help out customers.
I never have to wait for a cashier and I also find their cashiers are the friendliest. They never rush you when you are doing price match and always make small talk with you which is also nice.
I find it to be very clean and well stocked up. The only down side is in the ethnic isle , they don't tend to carry a lot of the items I like. It would be nice if they had more Arabic items.
My daughter has her dance classes out here so this is where I shop while she's there. I will choose this place over the one in Brampton anyway. People also tend to be a lot better mannered and polite in Oakville than in Brampton.