Lol, don't apologize, man :D You're asking and we're answering, that's what we're here for :) What are you apologizing for?
And yeah, Slam is an ability which pauses your swing for 20 rage and deals weapon damage+, whereas HS takes up your next swing for 15 rage for some extra damage, negating the rage gain from the otherwise auto-attack. By all means, Slam > HS when talented and when used correctly (like, don't use it recklessly risking to rage-starve for the next Mortal Strike for example).
Now @utarax - HS is like really really only good when you have nothing else to spend your rage on - Mortal Strike on CD, Rend up, Overpower not available, Battle Shout up, Sudden Death not available, you're casting Slam but still have more than enough rage to queue a HS in there - and these are a lot of requirements. Think of it like this - Slam is a filler, whereas HS is an extra filler if your filler isn't enough to dump all of your rage. But this is around 50-70 rage in total for all of those things and in leveling you barely get over 35-40 because of mobs hitting too weak and your whites also being kinda meh. So in conclusion, you will be using HS early on as there simply won't be any other options (still no Mortal Strike, Slam, Sudden Death, Taste for Blood), but as you reach these options you will find HS more and more lackluster compared to them to a point where you will only use it as your last-resort rage dump.
HS is a real gain for Fury, on the other hand, because as Fury you get a %miss penalty on your whites for dual-wielding. HS turns your white into an ability and thus applies the ability %hit instead of the white %hit. So instead of having 24% miss chance on that main-hand auto-attack, you'll only have 5%. But Fury on the other hand has to keep Bloodthirst and Whirlwind on cooldown as its highest damage source, and to use the Slam procs from Bloodsurge as priority above HS, both of which cost quite a bit of rage so this balances HS not to be strictly better for one spec.
I hope this satisfied your thirst for knowledge regarding warriors a bit :D That's quite a lot of information which even most warrior players don't know.
And back on the point regarding leveling, I've been leveling a Warr on Lordaeron (slowly, might I say) and I recently got the Corpsemaker, so at 27lvl (at which point I can also get 3/3 Taste for Blood) I am definitely respeccing to Arms, sorry :D I just love this axe too much - I've always gotten it on all of my warriors.