I don't like them but tbh I don't like about 99% of the footwear which does get raved about on here so from that point of view they're no worse than many shoes/ boots linked to. If anything they're just a bit bland.
There's a few similar styles on that "personal stylist" thread. Whether such a recommendation makes them better or worse I don't know. I have been dipping in and out of that thread and haven't seen anything on it I would wear.
I'm not entirely sure what "mumsy" means but if anything those boots are not "mumsy" compared to , well, lots of things recommended on S&B.