I mean, I'm a casual fan, but that first sentence.... do you have stats to back that up that his hits are in games that were already decided? As for the latter, over large samples "clutch" doesn't exist. The playoffs don't permit large samples; I'll give you that. I happen to accept as likely true that in the playoffs players have to figure out how to relax enough to let their talent play and if they can't/don't then they're less likely to play to their talent. Ortiz is a limited hitter. I suspect he won't be great at the plate in the playoffs. We agree on that. But there is no one else for them to play at SS who provides a net improvement over him. It is, as they say, what it is at this point.
And anyway, his sample of ineptitude with the bases loaded is big enough that regression is going to occur at some point and probably soon if those chances keep coming. Why not the first week of October? lol