I suspect this is one of those things to which people have greatly differing responses. For some it might an offensive eye-sore but I would be in line with Jimmy T on this. I think, within reasons, a few shoes by a front door looks more homely and it is generally harmless. I would not bother doing anything about this unless there were so many shoes as to be a genuine hazard. A little bit of untidiness can make things look less starkly institutional.
I would be much more hard-line about things like a consistent colour scheme, shapes, forms and materials for the building structure than more ephemeral things like pot-plants or shoes.