Like coupling, they took a great british TV concept and missed the heart and soul of what made the orignal a success.
In Viva Blackpool, the musical numbers jumped between characters advancing the characters and plot lines. Letting the actors of whatever their musical talents sing the songs.
In VL, the musical numbers were just that, musical numbers. They did not advance the characters as they often just re-enforced what the audience already knew about the character, did not advance the plot in the least. Worst yet, they were sing alongs with the original track.
Even Hugh Jackman sounded like he was singing along to the car radio.