This is up there with the Doom reboot as one of my favorite shooters. The story is great, it always keeps you on the edge of your seat, one second you're breaking out of a high security prison in Berlin, the next you're fighting a giant robot in London and you even go to the fucking moon!!
The villains are great, the characters are great, the action is always so over the top and varied it never stops being entertaining. There's something morbidly satisfactory about the shooting and seeing blood splattered all over the walls and seeing all the wreck you caused.
I also have to point out how amazing the level design is, even the way the maps are drawn is so well thought of.
The art direction is stunning, with the visuals holding up til this day, almost 10 years later.
The only thing lowering my rating here was the last level and boss. It started feeling laborious to fight all these bullet sponge enemies and the boss fight was just frustrating and led to a kind of underwhelming ending. Other than that, amazing game, I'll play the sequels