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A B leaguer is a rock or metal band that's decent enough to not be the worst, but still doesn't have the balls or the talent to join the A leaguers. They're like the fat kid in class who can lift a bench but can't do pull-ups.
"You’re good, but you’re not good enough to be in the A-leaguers. You’re like a B+ in a class full of A's.", A leaguer giving a B leaguer a hard time
"I’d take you over most bands, but you’re not the main event. You’re the appetizer.", A fan comparing B leaguers to A leaguers
"You’re like a B leaguer. You’ve got talent, but you’re not the main dish.", A critic giving a B leaguer a lukewarm review