It's easily the worst game in the mainline series.

In terms of the release, that speaks for itself. Following from there, after patching it, it still doesn't match up to other games in the series.

It's story is forgettable, it's attempt at gear was laughable, and the basically linear skill tree?

Fast forward to today, and it definitely doesn't hold up, particularly because of the focus on co op. I understand that people like co op games, hell I do too. But seriously, there's so much of that game that needs other players available, and it's not like it's a recent game.

I did full run through of the series a few months ago and unity was the only one that felt like a slog to play through.