Well, not really one of the worst games ever just one of the worst releases ever. It would've been an okay but still underperforming release if it were free at launch.
I'd imagine it's in the top 5 for biggest wastes in the industry so far though for the studio acquisition and game budget. Probably like half a billion with nothing to show for it. Not even a lesson learned because they're gonna turn around and do the same with Marathon and I doubt having the Bungie boost will help much since Concord was also apparently former Bungie developers.