funny how you choose to ignore me
after i provide evidence of your hypocrisies
'heroes are balanced, but usually not useful'
this has to be the most uninformed opinion you've presented so far xD
thorns aura relies on the opposing player using melee attacks, i think you're just obsessed with KotG, tbh xD
i thought you were going back to the original topic, not starting one of your own. this is supposed to be about which heroes are the worst, not your thesis on how heroes in warcraft 3 work. we MOD warcraft 3, we already know how the heroes work xD
please stay on topic, or stay out xD
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Priestess of the Moon is on the list of 'weakest heroes' because in 1v1 it is generally not that useful. It is viable in team games, but even then not so much. It's ultimate, Starfall, is easy enough to work around, and you'll be lucky to have enough mana to use it in the first place if you've been using Searing Arrows.
Dreadlord is one of the weaker heroes in and of itself as well, although some people might argue that it could be viable with a Ghoul Rush. Every time I see a Ghoul Rush, however, Death Knight is always the hero of choice, as Unholy Aura is far superior to Vampiric Aura.
Crypt Lord is also on the list due to it being silly. Its best ability would probably be Impale, but it doesn't exactly have the mana to support using it a whole lot. Which is fine, the Tauren Chieftain has a similar problem, but the Tauren Chieftain has a better passive for your army.
Tauren Chieftain is questionable, as there are much better options. Endurance Aura is always nice, War Stomp is great for AoE stun and Reincarnation isn't too bad for an Ultimate, but unfortunately the TC is incredibly slow and doesn't have the greatest mana pool. One might say Boots of Speed and Pendant of Energy, which is true, but all the same, you can use those items on any other hero that has better initial stats in those fields. Blademaster generally out does the TC in terms of being a melee Orc hero.
Keeper of the Grove is silly. It really is. Thorns Aura relies on your fragile army of Night Elves being hit in melee, which is questionable, so Frozen Throne's Mountain Giants are a decent addition in that regard. Even so, Mountain Giants are just too expensive for what they are. You'd be better off using Dryads. Dryads are good against just about everything. Especially Mountain Giants.
We've covered all these heroes, same applies to Goblin Alchemist and Pit Lord. But because somebody (xonok) disagrees with the argument 'you're just mocking me T.T', we will probably have to restate these points a few hundred times.