i know exactly what you mean
on intermitant/auto wipe theyre a joke
our SEAT seems to work fine so dont know why the rain sensor is so bad on my GTI

i just leave he wipers off and push down and manually flash the wipers or if its heavy enough go 2 clicks up to normal wipers. the auto function is crap
strangely though the juddering wiper blades stopped recently, which is a bonus cos that did my nut in

as for the climate control, i just always leave mine in auto but turn the AC off and on as required.
the fan speed seems to stay pretty constant on my car, though i always have it set to 19 or 20 but i dont think it works particularly well at maintaining a temperature. if its a clod day but very sunny the cabin gets too warm for me and i end up having to turn the stat down to 17 or 18 - the idea of climate control is surely to automatically maintain a temperature?
its not just the GTI though - our altea is the same (have to turn it up or down more than you should), my cooper s had it and it was either blowing like hell or not on at all and my clio sport had it and that was the same
the golf has the best climate control of any ive had but its not perfect by any means