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Let me explain everything point by point!
1. I know the game mechanics pretty well! The Archdevil's ability is decent, but he skips a turn, while the free Cyclops will rush to the center of the battlefield. Try to attack them! (The dog-like creatures are too weak to harm them). The Centaurs eliminate the Succubi due to their higher initiative. The Wolf Riders push the Cyclops forward, and the Shamans slow down the Nightmares! The outcome is usually disastrous for the Inferno faction.
2. Is Orcs the weakest starting faction? (Centaurs save the entire early game). The Inferno faction doesn't have a ranged unit for the first 3 levels of creatures! I can play without losses if the hero is Haghesh, but with others, I need to adjust my strategy a bit. Only an idiot would sacrifice Goblins.
3. The Spectres rely on numbers and fly well, so they are better and much cheaper.
4. Your first attacks are blocked by Fury.
5. Orc units are tougher than Inferno units, I'm sure (check out the topic about weak demons).
6. Have you even played Orcs? There's Shaq, Kurat; Tilseck; Krag; Keegan (because of the insane Goblin growth, they are simply unkillable). Arghat won't lose to Grok at all! What about the enhanced Executioners with Goshak? The Inferno faction only has Deleb as a strong hero; she's like Haghesh, a spellcaster!
7. Sure, boost your magic with artifacts. The Orc will have more attack power than you (1), and their defense will grow nicely (2), unlike the Demon. The Orc will do everything to find the Shield of the King of the Gnomes to protect against Berserkers!
8. If you want to play that way, just say so. I'll play as Tilseck, and Deleb (just tell me which version you have, 3.1 or 3.0, because for technical reasons, I can't play 3.1). Come to my game on the second or third week; I'll have a Ballista and cool Warmongers too!