While I disagree that the Oslo stage was boring, let's not forget that it is a song contest. Visuals look nice but they shouldn't be the main focus of every performance.
I agree, but it depends on if you see the addition of LED-backdrops only as a distraction, or as an actual addition to give even more flavor to the performance (I see it as part of a whole performance piece which includes not just the song but the overall presentation of it including choreography and visuals).
ESC lately has this "Idol/The Voice" flu (alot thanks to the juries) that thinks that just standing in one spot singing "conventionally good" is good enough and the actual
song aswell as the performance is secondary as long as the "vocals" are there. As a viewer though, I want to be entertained, I want performances fit for the entries though (sometimes standing in one spot with no effects is the most efficient and fitting choice for a song, sometimes it's not, it depends).
I do agree though that backdrops should be used when they fit and as additions, not distractions, however with the "less is more"-mentality, you kind of give no other options to those entries that would fit with a more "grand" performance.