Yes, and it makes you really miss out on the fun ones, especially if only get three of them. Two go into attribute improvement and the remaining one is probably going to be alert.
As not to derail - I often take non ASI feats. True that from a pool of maybe 5 ...
Back on topic - I very often take Heavy Armour Mastery. At lvl4 the -3 to damage is a life saver. Later the bonus loses relevance. I support an increase to DR at higher levels - 8th? Maybe if taken again?
Medium Armour Mastery IS good - +1AC (i.e. +3 DEX bonus), a bonus to Stealth, but as there are MA with +3 DEX bonus out there, not to mention the Yi-Ti thingy with unlimited DEX bonus, it ends up "meh". Had it not been for the aforementioned armours I'd had strongly considered MMA.
