In my opinion, there is no comparison. Mama Melrose beats H&V by a mile! We ate at both places last year and here are our experiences:
Mama Melrose:
- Friendly, efficient staff. For example, my 8yo found it difficult to find anything he wanted on the menu other than plain pasta so the waitress asked him what would he like to accompany it if he had a choice and he said "garlic bread". So she called the chef over to us!! He said even though they don't do it, he'd make garlic bread specially for DS!!! How's that for service?!!
- Beautiful food. Fresh and tasty! (Not huge portions so a possible downside is that sharing food is unrealistic - didn't bother us but just so as you know!)
- Great atmosphere - friendly and relaxing. We could have stayed there all day.
Hollywood & Vine:
- Slow - we made our ADR for 6.30pm and weren't seated until 7.15!
- Uninterested and unfriendly staff (after about a half hour we finally got someone's attention for drinks - only by seeking out someone though.
- Food was only ok, nothing special, limited choices with many of the trays empty with no-one re-filling them
- rushed, chaotic atmosphere
I'm looking forward to going back to Mama Melrose. I wouldn't go back to H&V if it was the only restaurant at MGM. Hope that helps. I'm aware that for every restaurant you'll have thousands of 'for' and 'against' opinions so take my opinion for what it's worth!