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Well, I don't know, Blindness lasts until you attack the unit. It can only temporarily disable ranged units. I don't like Berserk; Hypnosis is better because it's unpredictable which unit the monster with Berserk will attack.
2. A monster with Berserk will attack very predictably – the nearest unit... But the advantage of Berserk is that with Expert Fire, you can cast it on several units at once... sometimes even on all seven... :) So, with Berserk, Hypnosis doesn't even come close... :)
Berserk and Blind are the most effective spells in Fire magic. IMHO.
Added 4 minutes later
I understand that you are all avid players, or don't think that I don't respect you, but I'll say this: there's a trick in Heroes 3 regarding magic... In battle, you can open the spellbook 2 times in 1 turn...
This is easy and doesn't count as cheating... Basically, during the battle, you press the "spellbook" key (C) and hold down the button, and with the mouse, you click on the image of your Hero (in the upper right corner, on the horse, for those who don't understand). This also opens the spellbook... Thus, we open the book twice in 1 turn!
