The best bars are clearly a matter of personal choice
My favourite was Ramblas-relatively quiet and comfortable
I also used Exchange particularly when the football was on
Many liked Metropolis with its video wall
At least there is plenty of choice
As to acts I believe they are rotated on each cruise so you might see different ones to me
I agree that the standard varied from very poor to acceptable but again what amuses some people does not amuse others.
Ref Bars on Ventura.Like Birketts reply Ramblas is great for a quiet drink lots of Spanish Wine and Beers available also Tapas and spanish style meals in the Cosy Restaurant . A Spanish Guitarist [from Hungary] entertains.Metropolis also reccomended with its spectacular Video Wall and jazz style music.
The Red Bar near reception is also OK .Not too keen on The Tamerind she who shall be obeyed said it was cold. Music and Dancing available at night. Havanna awful .Strange impractical layout Poor sight lines seating too low partitions too high .Garish lighting.More like the Wheel Tappers and Shunters than downtown Havanna.Understand P&O are completely refurbish this area.As for The Exchange OK.Perhaps lacks atmosphere .Too big[?] Nightly Music Quizzies and Footie during the Day .Shares the area with the Casino.