One Dance isn't that bad really, it's only in the context of being #1 for 10 weeks makes it looks completely odd.
Usually the massive long running #1 songs have got something about them. Umbrella was a fantastic pop track and co-incided with the wettest summer since records began.
Bryan Adams had
that song from the Robin Hood film that every girl over the age of 15 wanted. Wet Wet Wet similarly had a long run because of the success of Four Weddings And A Funeral - but also England crashed out in the group stage of the World Cup 1994 so there was a distinct lack of football related songs that could've dominated the charts that summer.
You're The One That I Want, Bohemian Rhapsody, Uptown Funk!, etc...
All songs that struck a massive chord with the music buying public and you could understand why these songs were enjoying such a successful run at #1 - even if you didn't really like the song yourself.
One Dance, on the other hand, does seem like one of the most successful default #1 songs. It's certainly nowhere near as popular as Uptown Funk! with the people I know (both family and friends) and as others have posted, we've just got a generation of lazy people who will just stick on a chart playlist and listen to the songs from track 1 downwards...and One Dance is #1 so is getting played by default. I'm sure most Spotify users wouldn't miss hearing One Dance if it was suddenly removed from the chart playlist.
We have a generation of people who are too lazy to actively search for music. Until this changes, the UK charts are going to reflect the attitudes of the public far more than what songs are popular. The more non movers there are in a top 40, the lazier the public become when it comes to chart hits. I fully expect a chart with at least 30 non movers inside the top 40 before the year is out.
Anyways, Radio 1 should have a cap on how long a single can remain on their playlists. Say it's set at 10 weeks, that means after 10 weeks on the A, B or C playlist, that song is automatically removed from all playlists. Otherwise One Dance will remain on the Radio 1 A list until the end of the year!!!