I'd be pretty disappointed by this - did you call them and provide feedback/complaint or fill in one of those feedback cards?

I also seek hotel rooms with baths, and I always choose rooms if I can that mention specifically having a bath, or I call and ask. Star rating I have found does not a bath tub provide... (alas).

I've had some lovely experiences with Wotif finds etc, but disappointment is always possible and I'm sorry this happened to you.