Vista is my least favorite ship. That being said, it's the DW's favorite, and I'm sailing on her (the Vista, not the DW) for the 3rd time in September.
I don't like the enclosed atrium. To me it doesn't feel like a cruise ship. But the DW loves both of these things. We both don't care for the theater seating, so we arrive early and try to sit upstairs. It has my favorite, the Alchemy Bar.
And to be clear, I've always had a good time. To me, 80% of why I cruise is sitting on my balcony in my underwear watching the ocean go by. In the morning with coffee, in the evening with wine, and at night with whatever. In the world of TMI, I like to drink plenty of water before bed time to insure I have to get up in the wee hours (no pun intended), sit out on the balcony and watch the inky black ocean go by.