I would say Ikea Kitchens are OK provided you only use their units.
Buy the appliances seperate and a respectable name. I would go for Bosch or Neff as same replacement components (rings, heat elements and fans) as made in same factory and readily available.

The art to assembing a IKea Kitchen (or any for that matter that is flat pack) is assemble the units the day before and wood glue everything and leave for at least 24 hours. Often these units end up stronger than assembled kitchen units.
I actually find flat pack are quite good because you can cut bits out easier round pipes before asembling and then don't damage the rear panel so end up with a neater job.
I also recommend:
(1) that you screw all units together.
(2) you screw all base units to wall. I usually screw a 100mm x 50mm batton to the wall and then screw the unit to the batton.
(3) I often screw a batton to the wall to support the wall units on. This helps carry the weight and doesn't show when you put the under wall unit trims on. I just don't trust those flimsy wall brackets on some of those kitchen units.

A few quid (francs) on screws, backets, wood glue makes the kitchen stronger and last years. The advantage of a Ikea Kitchen is that you will probably be able to change the doors in a few years time if you get bored or damage them.