Cabinets are based on quality by the materials they were manufactured with. A good quality cabinet will be manufactured with solid wood which means the boxes are made from a quality laminated solid wood plywood. The face frames and doors on the other hand will be made from solid wood.
So, to answer your question, I will never down grade a product because there are different levels that meet many different criteria.
A customer’s budget will always dictate the level of materials. If you can swing it, I would purchase solid wood cabinets. If Ikea’s cabinets are solid wood then it will be a quality cabinet.
The process of assembly will differ do to them being a flat pack product but the engineering behind them has to meet a standard to support themselves as well as additional weight placed in the cabinets.
I had a client order them for his kitchen and we installed them. They seemed to be OK, for the most part as a finished good working product. I’m sure there are different options from ordering from IKEA for higher to lower grade cabinets.
If you can avoid them and find something similar looking for the same amount of money it will be the best thing. After a while they start tearing in the corners
They are bad quality, but cheap and decent looking. If you do it with your eyes open, there’s nothing wrong with it, but it costs nearly the same to install a decent cabinet. So, I don’th consider them to be the best move.
reasonable prices, priced around the same as other ready-to-assemble (RTA) and some in-stock assembled cabinets carried by the big box stores
lots of variety of sizes (especially different heights for upper cabinets - many other brands only have 1 or 2 height options at most)
Cons:
comes in lots of boxes, so you need to stay organized
need to assemble them which will add cost and time to your project
Depending on the outcome you plan to achieve, Ikea cabinets may be a good fit. The biggest disadvantage is the assembly time involved. There are many options for pre-assembled cabinets, that can save time and money on your projects. Best of luck!