I watched all of them. I liked Manizha's song before and now with the performance, I think it's going to be really powerful, lift you up in a way. Malta definitely interesting, good song, nice beat to it. Serbia seemed dancy, something I personally like. Not sure about the rest, France, Bulgaria, Switzerland getting a lot of talks but they were honestly kinda boring to me. I prefer fun songs so maybe that's just me.
Yes Serbia has a pretty good song IMO but I liked their colored 80's fashion dress in their video clip, but for their live performance they seem to be dressed all in black while dancing in front of a dark background. Where are the colors and the fun of their video? They want to look like opera singers now?
France is the favorite of the bookmakers at the moment but it's highly overvalued IMO, moreover people don't like to spend money to vote for obvious favorites usually.

