You mean an actual bathroom or a room with a toilet and sink in? If it were the latter I would understand but three rooms with an actual bath? In a three bedroom house? That is absurd.
One bathroom with a toilet, sink and bath/shower combo, one en-suite bathroom with toilet, sink and shower and one toilet + sink. I guess the technical term (as used by property people) is 2 1/2 bathrooms.
When I was young some friends of mine lived in a house where every bedroom (in a 6 bedroom house) had an en-suite bathroom, plus one additional bathroom. While I certainly don't expect every bedroom to have its own bathroom (or even close to it, really), I don't think its strange for a large house to have multiple bathrooms.
Sure, if you have a stately home I could imagine the reason for it. No one wants to walk for 10 minutes to go to the loo in the middle of the night. But a normal 3 - 5 bedroom house does seem a bit ridiculous space wise. Especially as (at least in the south east of England) land is the most expensive part of a building. I could think of much, much, much better uses of the space for my house rather than wasting tens of thousands of pounds worth of space (in land and building fees) on bathrooms.
Oh, I agree with you. I think the space could be better utilized in other ways, but I also don't find it terribly strange when it is used for bathrooms.
(For the ten minute walk thing, you just need a tiny toilet+sink room, you dont really need that many showers...)