Sazh's Magic buff isn't THAT amazing (+40%), and crucially, unlike Geno, his buff goes off at best at average speed, or slightly slower than average. Sure, Faith + Haste will help somebody lay down some nukes fast in Round 2, but usual comment about the Dungeon and rocket tag.
Random thought: Fang makes Edgar look kinda bad at 3.0, since they both have slightly slower than average speed MT status, except Fang also has more status, Sentinel hax, good damage, etc. Sure Edgar's status is 100%, but it's just one unlike Fang's set.
I'd say -
Lightning - 1.5. See earlier notes, but on second thought, she really does get Revival at a halfway sensible time (Floor 3?), so that's enough for 1.5 straight-up.
Sazh - 1.5. Lightning but with buffs rather than healing.
Hope - 1.5. Hope is too good to be a 1.0 I think - he's the best healer in the game and can get something approaching MT fullhealing if he devotes his turn entirely to that. In general defensive buffs degrade less when cast later in the round, I think - offensive buffs are best when they can stop enemies from taking even a single turn, a la Geno -> Deis1 say. Infinite resources on a healer have their use too. (Trashy damage, sure, but can't have everything.)
Snow - 2.0. Yeah, Sentinel hype is better in the dungeon than Sazh's buffs or Lightning's healing since it's a pretty unique effect that can trivialize some fights.