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It's unclear why everyone dislikes Inferno so much. Okay, maybe it's personal dislike for evil or demons, but it's absurd to say they are weaker than others. With Nimues, you can summon an army larger than your own in the late game. Then, archdevils will raise overlords, and those will summon more, resulting in 4 groups of overlords on the map, which will definitely take down at least one unit from the enemy group, which is useful against high-level units.
I successfully fought with such an army against undead, dark elves, dwarves, and orcs.
Although there are difficulties in the early game, the cursed sign and summons help. Melee units are often defeated without losses: mobs attack the summons, and the hero attacks the mobs in return. It's just harder against archers and casters.
Overall, all the Castles in these games turned out well. I don't know why anyone would hate them.
But I'll make my own top list of factions, from best to worst:
Demons I liked many of their abilities, plus the main ability of demons is good, especially at high levels. The only downside is that there's only one ranged unit and one teleporter, but there are enough summons for sieges. Visually, I also like the demons, although the new version isn't as good, even though they have some interesting abilities.
Dark Elves They are very strong in magic, and many of their units are good. And visually, they might be the best. Their elf units look great, and they didn't disappoint with the mythical creatures.
High Elves The Castle itself is quite beautiful, and there are some good units, both tanks and damage dealers.
Orcs The Castle itself doesn't look very beautiful, nor do many of the units, but overall, I enjoy playing as them.
Humans The Castle and units themselves are just okay. There are a few powerful units, but overall, I haven't played as them very often.
Undead Although there are some interesting abilities and advantages, I'm not very drawn to playing as them, but sometimes they perform well.
Magic The Castle itself looks good. Although many of the units don't appeal to me, only golems, rakshasas, and titans carry the faction, and sometimes the mages. But somehow, this Castle interests me, even though I often face difficulties when playing with it. I like all these magic manipulations.
Dwarves They aren't particularly interesting to me visually, nor in terms of abilities, but the runes are good.
But overall, there are no factions that I hate here; if I want to, I can play as any of them, but I prefer the ones I like the most.