bswpayton, it's not my intention to be critical here, but you might want to finish leveling your AST and SCH before you get too attached to an opinion. It's not really fair to compare WHM at 60 with their added suite of instant heals and buffed-up burst damage capability (i.e. what they had been lacking compared to SCH prior to 3.x) to your sub-60 healer jobs.

You might also consider that you are better at playing WHM at this point than you are at playing AST or SCH, which wouldn't be an unreasonable assumption. You don't want to base your opinion of any job on what you see other players do with it, because for all we on the forums talk about the healer role as being fairly straightforward, there are a lot of players who are not very good with healers, period.

WHM has no pet skills or placement to manage, no stacks, no card buffs, no metabuffs, nothing to really manage aside from enmity and MP, so the role is very appealing to those starting out as a healer, and IMO it's easier to learn as a raid healer since the job has basically no mechanics to keep track of. SCHs in a raid do actually need to know how to heal beyond having their fairy summoned, and sometimes you meet SCHs who are clearly accustomed to being auto-follow dungeon baggage and don't manage shields or aetherflow stack usage intelligently. Also, you run into ASTs who constantly forget to use their card buffs or do stupid things like keeping Ewer on Spread for god-knows-what-reason. If a WHM can cast Cure I/II on the MT and Medica I/II when the raid takes damage, they're kind of functional, and that's a pretty low bar.

I'll still take the bad SCH in a dungeon, but bad WHMs tend to squeak by in raids because they can usually slide under the radar as long as they are not blatantly neglecting to act.