I don't agree with you, Scorch is crazily a bad play as it is. On a SQ patroller, you have the same effect than Deteriorate for 3 more gold !
And Scorch isn't much more versatile : ok you can hit building (anyway, who would do it on the beginning of a game) and patrolling heroes (does that worths 3 gold ?), but you can't hit non patrolling units (so almost all you'd want to hit : your opponent knows it and won't patrol Spectral Aven (sad because your only other answer is Musketeer, which needs to survive 1 turn to target... at the cost of 1 base damage)).
Scorch is crazily weak, and it costs a card for no board presence ! Costing a card isn't a problem with Deteriorate because Black has so many ways to get back to 5 (skeletons on technician slot, Garth's midband, Dark Pact, Graveyard...) but with Red, it is ! Desesperation is a desesperate late play and protecting a Surplus with Phoenix and ephemeral units is very difficult.
Black starter is overplayed in tournaments, and I've rarely seen [Red spec]/Black spec/any being insanely top tier... But [Black spec]/Red spec/any have very good tourney results, despite non adapting to opponent's gameplan
People have an affective value for each specs, but yeah if they would bet 500$ on their matchs I don't think we would see many Blue, Green and Red starters :x
Hopefully Red has Zane and Drakk for early game, which are very good heroes.
But most of Mono-Red games rely the same few cards (Chaos Mirror, Kidnapping, Bloodlust, Crashbarrow, Pirate Gunship) and Red strategy range isn't as wide as decks which don't have 3 bad cards on starter, 2 bad Tech I, 2 bad ultimate spells and 2 bad Tech III.