Having never designed an FPS before, there's a good chance the following grand theory of combat design I'm about to propose is reeking globnonsense, but here goes: I figure you've basically got two approaches. You can either keep it simple but chunky, and use this to lure the player in right away by making them feel powerful and capable. Then, you can keep your relatively pithy verb list interesting by riffing on things like encounter and enemy design.
Then, there's the Texnoplazm method (Steam demo here) which is to slap you across the chops with a phone book of gun fu possibilities straight from the off, offer a taste of stylishness just piquant enough to convince you that mastering this toolkit seems like a fun and worthwhile idea, and let you loose. It's the "I suck at this, but I will not suck eventually, and then my enemies will be sorry and also impressed at how cool I look" approach. This method also ends up with you feeling much more capable than the first guy, even though they got to have more fun earlier.
That was a lot of words to say "game good, if a little overwhelming initially". Here's a trailer. It may contain the following verbs: punch. Punch but big. Slide. Slam. Dodge. Throw weapon. Grab weapon in midair. Kick. Wall run. Block. Parry. Have impeccable android butt.