Really!? On what grounds?
I used to ride mine around Ashton Court when I lived in Bristol. Was good, but a mountain bike is a lot faster, and IMO more fun, and those are the 2 criteria I’d use to judge!
On anything more than a smoothish bridleway they’ll be less comfortable and slower than an MTB, unless 90% of your riding fits that brief I’d disagree with the above!
If you’re the sort of person who likes to do a road ride and perhaps see what a certain bridleway looks like I don’t think ‘cross bikes really work. I wasn’t like that – I’d either go for a road ride, or I’d go for an off-road ride, never really mixed them up, so found a cross bike pretty miserable most of the time!
Granted I live in the middle of Salisbury Plain, so anything I do on my mountainbike round here I can do on my CX bike, but I stand by that comment. Out of interest, what MTB do you ride as Ashton Court isn’t exactly a gnar fest.