With my oldest, we started out using Ray's Arithmetics and she was used to having a black and white, non-colorful math program. We did the exercises orally and occasionally used the white board. For manipulatives we used acorns. So, when we decided to go with Math-U-See, she really didn't have a problem with the simplicity of it or lack of color, etc. On the other hand, she was so used to doing mental math that she cared less for the manipulative-based lessons. She didn't use the manipulatives to work through her workbook.
I think my youngest daughter had the same problem with Math-U-See as Tess' son, though. She did not do as well with Ray's Arithmetics, so I used Singapore Math with her during her first year. When I switched to Math-U-See, she did well with it, but complained that she liked Singapore better.
We have used Math-U-See for several years now and think it is a great program, however, we switched over to Teaching Textbooks this past year and both girls LOVE it. I love it because it is self-correcting, self-grading and has taken some of the stress off of me as far as the high school level mathematics. I was an English major for a reason! :) To be honest, I think *most* of the popular math programs are probably good programs and it is best to pick one and stick with it. However, what's best for one child or family can vary widely.
What level are you thinking of starting your daughter with? I might have my daughter's old workbook in that level that I could send you some scans of to look at, if you haven't seen the actual workbook. Alternatively, you could go to the Math-U-See web site and print out worksheets for that particular level. Hope this helps. God bless your efforts! :)