My personal favorite strats are as follows:
Massing footies in the beginning with an MK. I go in, attempt to harass/scout. I then come back in with about 20 footmen, and attempt to nuke a main with them. I upgrade to keep, and build a second, smaller wave of foots. I go in, and try to disrupt the enemy's rebuilding(assuming they didn't quit). During this wave, i get castle. I'm building footmen as I'm attacking, with rally point at my hero. During the second wave, i move rally point to just somewhere in my base, and keep building a few more foots in case the enemy manages to counter. I then get knights with foots, and hit again. If they attempt to go air, i usually am able to stop them in the second wave of foots, as i kill the buildings. If they manage air, i quickly set up an aviary and arcane shop place and get some hawks. I get knights and hawks together then, and waste the enemy base and army. In this strat, master priests help, but they aren't necessary. The heroes i use are : MK(must have first) then either a paladin or pitlord, then either paladin, pit lord, or beastmaster.
Another good strat is to get riflemen for the rush, with a mountain king. You then go in and target their hero constantly. If he runs away, fall back and hit the unit's rifles are strong against. If the units run back to fight inside defenses, hit outlying supply places. Try to tech while all this is happening, and keep building rifles to send to the MK. The next hero you want is the blood mage, to help kill of their heroes. The BM's hero killing ability is truly underrated; with the MK or warden, he can slow the enemy hero so that he is easier to hit, and make the spells more effective. This make's the MK's hammer or wardens knife even more deadly to heroes. His flame strike also helps against defenses, but the mana drain protects heroes from that nasty horse-man(keeper, for those of you who can't tell already from my other posts regarding him), as well as other hero killlers, by simply taking away all that nasty mana;you need it more than they do! At tier 3, you mass gryphons, and just level their base. Ideally, you want to sit at their base the whole time so they can't creep, but if you get forced out early, don't go back in with just heroes and some rifles; go try to get them while their creeping, so you can build up some more and get the added bonus of taking out their army.
The next human strat is one that's beaten me several times, and i'm just ****ing tired of. You get foots for rush, with a blood mage, and rush them. You then go breakers, and get another AoE hero, either BM of pitlord, and use the AoE spells on the breakers and anything near them. The breakers have that damn immunity, so they really don't give a shit that they have fire all over them. Now, not only are you raining fire and brimstone on your enemy, but you also have some sorcs and morts, to kill any other units they might have and turn them into slowed pathetic little sheep. This strategy makes me mad. Why can't they just play like normal people, and get knights and gryphs?Well, as they say, war ain't what it used to be.
Of these strats, i have replays of the first two in action. PM me if you want them.