In my theatre going experience, two stand out-
Sunday in the Park with George (the 2008 London transfer), the projection technology, while striking at first, felt like a gimmick. Call me old fashioned, but I actually like seeing the hand made set pieces (the trees from the painting, soldier, etc.) fly in and out. That's what makes the original so magical. The leads were also terribly under-whelming.
Ragtime (the 2009 revival) Saw it at Kennedy Center before the Broadway transfer. Marcia Milgrom Dodge's "bare bones" production (a trend still irritatingly en vogue) was not only lackluster, but highlighted the problems with the show. Leigh Ann Larkin, (fresh off her triumph as June in the LuPone revival of Gypsy,) as Evelyn Nesbit was particularly flat, and I remember thinking "it's like they're forcing her to be up there." It was the first (and only) time I felt let down by an actor onstage, because I had seen how good she /could be/ in Gypsy. The only good thing about the Ragtime revival in '09 was Christiane Noll as Mother.