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That said, I am one of those people who doesn't get a lot from them so I can speak to some of criticism. Part of it is just the aesthetic, and theirs doesn't match how I decorate my own space or what I usually feel good around. That's just the nature of aesthetics, though, and there's always going to be some difference in taste between any two people and any two regions.
As for quality, though, I think the critique you hear reflects the quality of their budget products. If you're eyeing modern or euro designs at a fancy furniture studio and then go to IKEA to find a cheap approximation, you discover that much of the cheapest stuff has the same flimsy glueboard, peeling laminate, and unstable joinery of the cheap stuff at Wal-mart.
That shouldn't rally be a surprise (cheap is cheap for a reason) and doesn't hold true for their mid-range and higher products. And heck, it's not even really fair when Walmart and Target furniture isn't any better, but it's enough to keep feeding the reputation.