I think everything looks better in IKEA than it does at home! Of course everything is professionally laid out and is put together perfectly. Definitely there are some things that are more solid or durable than others. The dresser we bought is good, but the kitchen cabinets are the best quality of everything we purchased. I'm going out on a limb and say that IKEA furniture is not Heirloom quality or something that will be passed down from generation to generation
Its good for filler furniture, display items, or when you don't want to (or can't) spend $$$ on decor. I like mixing up my furniture, but honestly I'm not really into decorating and keep things simple. I'm much more interested in building, renovating, and interior design.
Heck no!... Although my daughter is still using the same dresser that was in her nursery and its from Ikea, she's 7 now. Some pieces definitely last longer than others. I knew this dresser was a good one because I had purchased the same one for my older daughter when she was about 6 and she too still has hers and she is now 16!