Madame Tussauds London - Worth a visit?

I recently heard that Madame Tussauds was rated as one of the most disappointing tourist experiences in London. I have not been because of this survey on Madame Tussauds and would welcome comments from anyone who has?

Madame Tussauds is a Wax works. This is where you go to have your photo taken with celebrities and stars that you would not normally get close to. They look quite real to me. Who was Madame Tussaud anyway?

http://www.madametussauds.com/London/

Madame Tussauds Opening times

Madame Tussauds is open seven days a week. Normal opening hours are 9:30 – 5:30. Peak opening hours are 9.00 - 6.00. Peak times are every weekend and UK school holidays. Please refer to www.madame-tussauds.co.uk for full details. Christmas Eve 9.00 - 2.30, closed Christmas Day, Boxing Day 10.30 - 6.00 and New Year's Day 9.30 - 6.00.