oh yea they are dead simple. I had a little experience making beats before using older lofi equipment, but every time I've tried, I ultimately bounced off. I would make 2-3 bad beats and lose interest. This time it seems to have stuck though as I am working nearly daily on music which is very unlike me. I think the 303 is just such a sublime machine to work on once you get flowing and it just sounds SO good.
I thought about a 404mk2 but it honestly seemed TOO complicated for me. The 303 is the same skeleton but missing the expansive features that make it scary to learn.
You will have ZERO issue learning to use the 202. It doesn't even have a sequencer. All you can really do on it is record samples and add FX to them. It is basically one button per function. It doesn't have resampling so you have to bounce it to your 404 and back if you want to stack up its FX, but for the most part its Pitch function is most of the reason to own it. I am not sure why but the 202 stretches and pitches things SO smoothly, so much better than any SP to come after it.