Add to that rusting rear subframes, radius arm bearings making the rear suspension crooked, back brakes with manual adjusters that always but always seized up, and front suspension swivel joints that needed stripping and reshimming every MoT without fail and usually at the 6000 mile (!) service interval. Add in engines that needed serious attention by 70-80k miles, and I really don't miss them.Never owned one, but I know people who did, and they totally agree with you. On the other hand, it did revolutionise the small car market, and people making small cars copied the basic idea of a transverse engine, but without all the initial compromises (gears in the sump, radiator in the side, leaving the distributor exposed to the elements, problems with the primitive rubber universal joints). Then, of course, there was BMC's renowned quality control and dedicated workforce...
Back in the early 90s I was into cars and fancied building a hot Mini. I priced up what I'd have to do and a donor car, and fairly quickly got to £4-5k, plus DIY time. That was enough at the tie to buy a decent 205 GTi that left any Mini for dead. So instead of having an outbreak of common sense I bought a Triumph Spitfire that was slow, thirsty and unreliable.