"It’s not a song contest any more, it’s political," said Forsyth. "It’s all so biased, it’s developed into a farce. I’ve stopped watching it, the last couple of years."
Wogan said he would consider retiring from his long-time role as host of the UK's coverage of the event.
The BBC Radio 2 presenter said it was “no longer a music contest” after UK-entry Andy Abraham finished joint last in Saturday night's final.
Cowell said: "If people enjoy it as entertainment, that’s great, but it’s all a bit empty and meaningless as a competition."