Creation
Kyle Rayner was created by Ron Marz and Darryl Banks due to the unpopularity of DC's Green Lantern title. It was decided by DC editorial and Green Lantern editor Kevin Dooley to scrap everything, including Hal Jordan as a main character, and start fresh with a new Green Lantern lead. So Marz crafted Kyle to address what he thought was wrong with the square-jawed, serious character of Hal Jordan.
Rather than a stalwart hero from the jump, Kyle was a random guy with unrealized heroic potential that became the new Green Lantern by sheer chance. The unremarkable life he had lived up until that point would give him a sense of wonder and excitement over his new circumstances as the universe's sole Green Lantern. And as an artist, he would have an exceptional imagination and create vivid, complex constructs beyond previous Green Lanterns' use of a power ring.
Replacing a main character was nothing new, especially not with DC Comics. However, Kyle's introduction was made controversial due to Hal's villainous departure from the series as Parallax. This dishonorable discharge angered what fans the former Green Lantern had, and resentment over it became directed toward Kyle as his replacement. This vocal backlash would not prevent Kyle's introduction from being a success and from the character growing in popularity over the years.
Controversy
Due to slumping sales and after seeing the sales spikes with events such as the Death of Superman and the Breaking of Batman, DC decided it was time to reinvent Green Lantern. Ron Marz was hired to orchestrate Hal's downfall and insert Kyle as the sole Green Lantern. DC went so far as to remove the corps and anyone with a power ring (Alan Scott, Guy Gardner) as well. Many longtime fans were vocal with the manner in which Hal Jordan was "tossed aside". Sales did remain high on Green Lantern for quite some time and Wizard ran a fan poll to see which was the preferred Green Lantern (Hal or Kyle) with Kyle winning by 2 percent (51 Kyle, 49 Hal).