The day I lower my standards so far that I'm praising a game for functional controls will be a sad day indeed. It'd be like saying, "This car is great, it stops when I hit the brakes! Amazing!" Or, "My new PC is fantastic, it turns on when I press the power button!"
guns both varied and satisfying
Stock standard array of FPS weapons, I didn't find any of them particularly satisfying to use with the possible exception of the double barreled shotgun.
good enemy variety as well for an FPS.
Didn't really notice. It was all just chaff for the circle-strafing, spam-clicking mill. Wasn't enough variety in their behaviours for their differences to matter beyond some of them running up to slap me and some of them sitting back to shoot me.
See comment regarding controls.
If you say so. Didn't really notice. Vaguely remember some noises that the cool kids would probably describe as [something] metal.
...but I can't really see stuff to be bored by, unless you played in a way too low difficulty?
I played on the highest initially available difficulty. Perhaps it suddenly becomes good on the harder difficulties, but the genius designers decided those should be arbitrarily locked off until I complete the game in boring mode and since the game is too dull for me to complete I shall never know.