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IMHO, Lethos is a good alternative for the Academy. I think he is very effective against the Elven faction, as the Forest faction has a достаточно high initiative, so the plague will work accordingly (+cursed lands).
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I don't know, I don't see anything OP about him either and his ability is basically a pretty questionable thing, plus I don't like taking Dark Magic for TE (although they convinced me that it actually suits them)))). Maybe he's just good for leveling up; maybe if you play poorly it's worth choosing him, but as Mdance said, the same Waishan with hunters is very strong—maybe you won't clear neutrals as quickly as with Letos, but if you put in a little effort the effect will be the same. Although this is my subjective opinion, I just don't play as Letos; maybe it's not him who is weak, but that I play him poorly, but playing as Waishan is much more interesting.
Railag is of course beyond competition... :) ... the poisoner Letos is optimal as a support hero—he clears mines twice as fast (his Dark Magic is obviously out of place, but if you level up "Lord of Pain" > "Cursed Earth" at the start, it really amuses me) But actually, lately I've been taking Eruina as my гг (magic support from witches), two good skills right away (Chaos and Attack). Until I build the Twilight Halls—I run Letos :D.
And leveling Eruina brings me such joy—the same needed skills always pop up, and a ballista with 3 shots and fire damage is pretty cool in my opinion) :p
well, and the choice of hero depends heavily on the tactics.vot.
Lethos is good in general, but I just can't understand the appeal of dark magic. I'd rather go with summon + chaos.