perks do make the game more interesting.
Yeah, without the game it wouldn't be that special
but with the perks you can essentially have a totally different gameplay. So far, I'm using all the passive damage perks (supersonic waves, hand of god, poison darts, mirror image ghosts with shotguns, ....) and everything that increases powerup drops
played through the 'storymode' in one go
Also: use auto-perks, so you don't have to select them every time you level up