We've done Mama's and H&V. We LOVE Mama's and I will never go back to H&V. It was crowded, noisy, and the line was always long at the buffet. I love Italian food and Mama's is a lot easier to relax and cool off in.
I agree with others - BOOK EARLY! I called 3 months prior to our upcoming June 4-7 trip and there was a 1 hour window left for dinner at Mama's.
I do highly recommend it though - its nice to walk in at T-30 minutes and just sit in a reserved section. The view is JUST FINE from that side. You're still straight on to one of the mister-projections and see all the barges, the boat, and the scenes.