As much as I love The Smiler I think it needs some work doing to it. Not quite DBGT 2016 to 2017 level but still.
The queue line needs looking at, drainage and maybe the addition of gates for quieter days. The broken screen and speaker at the base of the second lift hill needs looking into. Some of the Marmaliser effects such as the water mist need to be fixed or replacing and the entire area needs a good clean and touching up. Not a vast amount of work really. A small team could probably do it in a few weeks (except for maybe the drainage. That might be a bigger job).
When I first rode The Smiler in early 2016 it was my favorite coaster, now it's slipping down my rankings due to the above issues and the roughness. A real shame.