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I never said they were "exceedingly poor."  He's not a mess like Aumont.  I just really dislike the whippy arm action.  Watch some video of Pineda, and then tell me how many good starting pitchers throw like that.  That's a motion you see out of the bullpen all the time but rarely out of the rotation (especially from a veteran who has remained durable through the years).
And while "bad" mechanics are often linked to both health AND performance, in many cases they go one way or the other.  Inverted W, just to pick an example that most are familiar with, doesn't have any major effects on performance-- in fact it may very well help a pitcher generate more velo and movement, but many believe it leads to all kinds of shoulder and elbow problems.