Nope, not being condescending or judgy at all, it’s simply my opinion. You’ll never play any song better than whom ever wrote it, and if you’re looking at a recording career, who wants to hear an album of covers done by Johnny Local Bar Band? Nobody except your family and friends.
I’m not saying it’s a bad thing to play covers in clubs—you’re just not going to go very far with it.
I’ll pay serious cash to see The Kings Of Leon or Muse... I don’t want to pay at all to see a local bar band—most of them aren’t that good, and usually think way too much of themselves.
And by the way, you copying a song that someone else wrote is not creative, the person who actually wrote the song is the creative one (see the last part of the paragraph above).