Just thought of a few more...
Aladdin - Love Disney and loved the film but for some reason this one disappointed me. I loved beauty and lion king on stage. I even liked Little mermaid, but Aladdin just looked cheap and bored me.
Gentleman's guide - Just can't get into it.
Hair 2009 revival - The performances are what made the show so great. I have problems with the book. The whole show could basically be told in 10 minutes. There really isn't much of a plot but clearly Hair's focus isn't really on the plot and more on it's themes so i get it. I was just underwhelmed. The second act is really what brought the show down for me.
Mary Poppins - It has great moments but it's a very slow and boring show.
Pirate Queen - I had very high hopes for it. Stephanie J Block was absolutely fantastic in it, she was robbed of a tony nomination that year. But the rest of the show is very uninteresting.
One show that I thought would be terrible and ended up being great was Shrek.
Countdown til Jordan comes on raging about how much loves me! 3..2..1...