As one of the developers who worked on the original Call of Duty back in the early 2000s, Chance Glasco wonders if the behemoth FPS franchise has run out of ideas. A series veteran and one of the original members of Infinity Ward, Glasco says he doesn’t play much CoD anymore–though he does enjoy a bit of Warzone.

In an interview with Tulsa, Oklahoma’s News 9, Glasco shares his experience as one of the 23 employees who left Medal of Honor developer 2015, Inc. for newly established Infinity Ward to work on Call of Duty. “We knew we could make a really good game,” Glasco said. “Activision gave us the freedom to do things we couldn’t on Medal of Honor, but it was still a new franchise.”

Call of Duty wasn’t an instant hit when it released in 2003. Instead, it took time for word to spread. “It didn’t have a big spike in sales right away,” Glasco recalls. “It just climbed gradually as word got out. Multiplayer really hooked people, and over time, it became huge.”

Yet for Glasco, the now-dominant franchise may have grown too big, or been around too long for its own good. “It’s almost like The Simpsons–it’s been around so long that it feels like they’ve run out of ideas at times. It kind of wandered into left field, but I still enjoy playing Warzone.”

“I spent more time making WWII games than America was actually in WWII, so moving to modern settings felt refreshing,” Glasco added, referring to the shift in setting that started with Modern Warfare in 2007. “I wouldn’t say [Call of Duty] peaked at Modern Warfare 2, but that was probably the best game we made.”

Call of Duty gets a new main-title release every year, and has followed that release pattern since 2005. The series now also has multiple ongoing live-service games including free-to-play battle royale title Warzone, Warzone’s mobile port, and Call Of Duty: Mobile. The most recent major CoD release was Black Ops 6, in October last year.