I moved a lot, and in different countries. I bought different IKEA furniture pieces. There's no one size fits all. IKEA is different by country, by price, by product line... For example, I have a bed I bought from IKEA made of pine wood. Just a few years old, but it shows no signs of wear, and there's no reason for it. On the other hand, I've inherited kitchen countertops and cabinets from the previous owner, and judging by the tags, they've started their second decade sometime this year. It's particle board all the way. The hinges have completely destroyed the nesting in the doors. The doors, literally, fell off. The countertop bent because of weight, temperature, humidity... it's the kitchen after all.

I've been trying to fix these things as the problems appeared, but, really, most people in this situation would probably tear the kitchen down and put the new one up. It's ironic, because we live in a "historic" neighborhood, where the houses have been built in the 18 hundreds and some, perhaps, even 17 hundreds. But absolutely nothing in these houses is more than a decade or two old. They also use materials that superficially resemble the old stuff: plastic panels with wood-like texture, unnecessarily thick aluminum window frames that resemble the old wooden ones (and open in the wrong direction!), plastic shingles that look like ceramics... And everything is made of crap. So much so that the whole neighborhood is perpetually under construction. It's like the Winchester Mystery House that its owners keep building in hopes to stay alive.

There are definitely different tiers. I've bought simple shelving that began to fall apart within years (Billy maybe?). I have 10 years old bedroom furniture still going strong (Kallax/Malm).

Did you read my whole comment?

I said some lasts less than a decade, and I have quite a lot of IKEA furniture. I also said its better than most cheap furniture.

I even mentioned a specific piece of IKEA furniture I own that is clearly not going to last a decade.

Doesn't last through undergrad in most cases. Mostly because you move a lot.