ummm for humanss there is the spell breaker(that unit you dont know its name)...it is used quite a bit and is very useful against any buffs that are used around in a battle...The Dragon hawks are also a new unit... They are a good air unit that can completely disable another one and damage it. Its attack is descent 17-20 i think... And there is also the blood mage which is the new hero...with flame strike that is very effective against low hp units and banish which can be used on heroes to increase the damage of spells on them... Blood mage's Flame strike can be used with Am's blizzard have a good AOE..You can add spell breakers in there becoz they are immune to magic and you can cast flamestrike and blizzard without anything happening to them.
In general all the new units are being used equally!!
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ull have much more fun in FT and btw the neutral heroes that are being used the most are Beast master/ Naga sea witch