I don't mind Revell kits. As has been alluded to earlier, it gives me an opportunity to hone my modelling skills. I've built the P-61 kit twice. One black and one olive drab version. I like them both.
Were the instructions perfect? Nope.
Was the plastic quality perfect? Nope.
Was the fit of pieces perfect? Nope.
Was the finished product perfect? Nope.
Did I have fun building them? Yup.
Did I like the way they turned out? Yup.
Will I build Revell kits again? Yup.
Is there a "Perfect" model kit out there? Not on your life.
I don't mind the quality of these kits. I'm not a perfectionist, nor am I suggesting any of the other modellers on this site are (although some of you may be). Will there ever be a model kit , or part thereof, that someone won't whine, bitch, beef and barf about? Nope. I understand that many people want an accurate representation of a specific piece of history when they model it. A model kit is what you start with. How much detail or accuracy you want to put into it is your choice. If you're willing to devote the requisite time and effort into a model, you can start out with two slabs of plastic stock and you can end up with a finished result of the subject you're trying to create.
If you don't like Revell products, don't buy them. You can also do what I do. When buying a kit, I open it at the cash register before purchasing it. Any hobby retailer worth his / her weight in salt isn't going to deny you the ability to open a kit to look at the contents when you're about to shell out "X" number of your hard earned dollars. What better place to find out that the kit you're about to purchase isn't up to your standards. The hobby shop owner can then ship the inferior product back to the manufacturer.
Failing this, if you don't like the product, don't be afraid to complain to the manufacturer. Any respectable company thrives on cusomer feedback. They can improve their product if enough people bring the inadequacies to their attention.
I could go on and on but I think you get the drift of my message. Who knows...with Revell-Monogram moving their production operation to China, maybe there will be an improvement in quality.
My $0.02 worth.