Not sure why people think the Coaster livery is bad, is simple yet effective.

Trust me I've seen liveries that are a hell of a lot worse over the years, here is some examples.

Jaylines Lime and Grape coloured Mercedes Benz 709D when they just put it into service in the previous operators livery - https://www.flickr.com/photos/gjm-photog...6884921242

Blackpool Palladium Livery looks like they just used undercoat for the livery - https://www.flickr.com/photos/gjm-photog...7779126285

Blackpool Metro Coastline Pool Livery version 1 (Mustard) also on loan to Arriva North East - https://www.flickr.com/photos/gjm-photog...1884391608

National Express West Midlands / Coventry new livery (again the obsession with grey) - https://www.flickr.com/photos/gjm-photog...1974364534

Nexus Bus / GCT livery (suppose it matches the tape that keeps the buses together and yes the 4x4 is towing it) - https://www.flickr.com/photos/gjm-photog...1058743001

There is plenty more subject to taste, then there's a few questionable advert liveries.