No, the minimum is generally too high and the cards do thus not get a distinct advantage through the reduction. And as I have said before: I feel that power reduction has been sneak-nerfed through lots of +attack cards. :/
Yeah, with power reduction, it can hurt to havea high minimum.
though, it is usually worth it if your opponent doesn't reach the minimum.
cards like Platinum are great for low power cards, -3 min 1 is outstanding.
however the standard of -2 min 4 is just sad, if only it was min 3
however, All stars are a nasty clan to face because of the reduction.
if you some how manage to pair them with Eyrik it is pretty decent.
but unfortunately, even Eyrik has a nasty minimum of 5.