Sometimes it's not a matter of a player changing a song because they suck; often, it's pure laziness or complete lack of a common standard or goals. Sometimes a very good musician has heard the song a few times, they have a vague recollection of it, but rather than sit down and take a closer listen, they go from a distorted memory, which often leads to some significant departure on fundamental elements of the song (chord progression, root notes, signature and melodic components, etc.). When I say "fundamental elements," I mean parts that even non-musicians know, appreciate, and have come to anticipate and expect when a band plays the song.
Unfortunately, the other band members did sit down and take a close listen, liked the popular hit recorded arrangement, and tried to reproduce it. Now you have three or four musicians respecting and playing to one arrangement (the most well-known or popular recorded version) and one musician trying to force his square peg vague memory interpretation into the round hole, and it's not working. The amalgamation just sounds objectively bad. That air-tight arrangement that resulted in a hit song has been tampered with, and it's not air-tight any more.
At that point, something's got to give. Either the band has to decide that they are going to unilaterally depart from the popular well-known recorded arrangement in a unified and fundamental way that will be flattering and as good or better (and I hope someone in the band has the arrangement chops and commands enough respect to make that happen), or they all need to get with a faithful interpretation of the arrangement on the recording. But you can't have a divided band trying to force parts together that no longer fit because some have been altered and others are played faithfully.