Sometimes it depends on what you are used to.
Had a
Leon Mk1 Cupra TDi - fairly firm, from what I remember
Had a
Leon Mk2 FR PD TDi - way too hard for my liking. Crashed off every bump. Only found it comfortable on smooth roads
Had a
Leon Mk2 FR CR TDi (i.e. facelifted model) - perfect setup and ride for me.
Now got a
Leon Mk3 FR150 TDi - I think the ride sits in between the two Mk2's.
I'm happy enough with the ride of the Mk3 (on 18's), but I appreciate that it could be too firm for some people. I find it a refined firmness, i.e. I don't feel like I'm crashing off of each bump and pot hole, but you know that it's a sporty ride.
Personally I think the Leon looks more suited with 18's, so I was willing to accept a bit of a trade off in ride quality. However a similar ride to the original Mk2 would have been a deal breaker for me.
So my (fence sitting) answer is, in between just right and too hard.