I agree with you. However this article being on msn is high praise as they don't usually mention the micra. Not sure about this Auto magazine tho as others probably know it better than me.
At this micra's 18 year age and given that you can pick one up cheaper for closer to 100 to 150 quid on ebay, maybe with a little bit of work, which you can't with most, if not all of the cars you have mentioned, I would say the micra wins hands down for that age banger value wise. Plus, there are seem to be more micras around at this age than the other cars you have mentioned bar maybe the polo. Talking of which, the micra new, had far fewer breakdowns in its first 3 years of motoring than the legendary reliable polo.
We could be debate which of the the bangers you have mentioned is the best value for money at around the 18 years old but I recon the micra would be within the top three for the price.
I was forward thinking of the K11 successor potential long term reliable runabout bargain bangers now that the K11 is becoming few & far between to find in all good order/condition & disregarding the K12/13 as they are not long term viable in this category?
What other long term reliable bargain banger runabout buys are potential K11 successors in addition to those I listed?