French food is a favorite for me and my girlfriend. Since we were staying at the Bellagio, going to Michael Mina's was inevitable. Michael Mina's at the Bellagio is an intimate setting, fairly quite and more upscale.
We had a great dinner. Had some lobster ravioli, a butternut squash soap, duck breast, and seared ahi tuna. All delicious and perfectly prepared. Dessert was equally enjoyable, and we both splurged and had the trio that was wonderful. I have since visited another Michael Mina restaurant (Bardot Brasserie) and it was another enjoyable dining experience in a less formal setting.
TL;DR - go. :)