I didn't calculate the actual values here; I just provided examples. Regarding the 50 HP, it's figurative. If, say, a dragon takes 350 damage, it will retaliate with the same force. But if angels take 350 damage, only one will remain, which reduces their damage by exactly half! Yes, large Dragon-Golems can get stuck... But you can also clip the wings of angels... It all depends on the tactics and the opponent's experience. But there's also an advantage to size: they can protect both the Djinn and the Hero at the same time! This is very effective against a real opponent!!! I think spells like "Bless" and especially "Cure" are only used against the AI. It seems strange to waste a hero's turn casting such spells when the opponent might cast, say, a "General Protection" spell. It will be very painful if you don't cast a "General Dispel Magic" or something similar. 8-) By the way, there's a trick to this, as many negative spells don't affect Golems, so in my opinion, this is a plus for playing against a real opponent. As for hiring Titans in pairs with Djinn, and some brave players taking Mages, it's almost suicide... I haven't met any pros playing as Titans; in my opinion, it's only for playing against the computer. 8-) Although, maybe there are changes in their favor in an unofficial add-on... ;-)

Regarding Witches, I don't know; you probably mean an unofficial expansion. Unfortunately, I haven't played it, and I've only encountered Witches as neutral creatures that can't be hired in the city, only in huts.