the Jester
Legend
So the feat system in dnd 5ed. as most of you have noticed I'm sure, is completely out of balance.
Let's just stop right there. Have you played the game, or is theorycrafting? In my experience- which so far includes pcs with the Sharpshooter, Spell Sniper, Mobility, Heavy Armor Mastery and Keen Mind feats (off the top of my head)- choosing a feat over +2 to a stat is actually a very hard decision. If the feats were as broken as you suggest, it would be a no-brainer.
Heavy armor mastery is one of your chosen examples. It's also one of the feats I experienced early in 5e. Is it powerful? Oh, absolutely. Is it overpowered? Not in my eyes. I think there's a stronger argument for Sharpshooter or Great Weapon Mastery being overpowered, but neither one is in my experience.
So, in short, if you haven't played with feats in the game, I would suggest reserving judgment. If you have and you don't care for them- well, they are completely optional.
My problem is, since we only have the "early access" to Dnd 5ed. We are in need of a lot of patches... or maybe house rules. What do you guys do?
I don't understand what you mean when you say the "early access" here; do you mean "early access" as in "the game has been released for nearly a year now"? Are you referring to some kind of expectation of massive numbers of splat books? Because that is absolutely not the model 5e is running under.
As for the need for patches, I don't see it. The game is simple yet robust, allowing complexities to emerge, and seems largely bereft of 'trap' options like the 3e Toughness feat. I guess basically, I disagree with your entire premise, and especially with the way you take it for granted that everyone agrees that feats are borken. Everyone doesn't agree; there are a few posters who feel that way, but I don't see any kind of consensus on the topic by any means.