The singleplayer offers great bot-play, both in instant action and levels. However, there's simply no getting around it. This is an arena DM/CTF game with half guns, half swords.
Note, if you don't like people slicing each other (And be honest, swords are just as useful as guns. You don't see that sort of balance just anywhere.), remember, you are insanely agile. Pick a fast character like Selket ("Running won't help you... I'm faster." Sorry, just love that line.) or Lauren and leap around like a crazy woman. You have speed, wall jumps, double jumps. Most folks won't be able to slice you if you keep hopping around. While you're doing that, fill the chaser full of explosive splash damage (Splash damage more than direct hits, because if they see what you're doing, they'll try to deflect.)