More thoughts about Patience:
Although I personally like the Patience feat for the short term (it'll be fun to figure out, for a while) I'm leaning towards the "feats shouldn't give negative stats" camp. I know it is exactly like Power Attack and Power Attack never caused any issues, but I just don't think it's a good design pattern to use.
For the people saying "at least it's more interesting than must-includes like Overwhelming Critical": That feat is only uninteresting because it has no competition. If there were also feats like +5% attack speed, ánd +2 imbue dice, ánd +2 W ánd 10% doublestrike to compete with it, the choice between them *would* be interesting.
The tradeoff doesn't need to be written on the feat. The system of feats already had this build in.
With casters you can see this clearly. You did a great job on that. They have to choose between intensify, burst of glacial wrath, embolden or legendary focus. With two feats locked for ruin, that give 6 different combinations of two feats to take. I'm enjoying that balance a lot. Melee just needs *more* epic feats at the power level of overwhelming critical to reach this interesting tradeoff territory, they don't have to be shocking.
With destiny feats this is already accomplished. Great job also. Doublestrike, perfect fighting, crush weakness, harbinger of chaos/law, deific warding and legendary toughness are competing for 4 slots, in a way. Or 3 if you do arcane warrior. Epic feats for a melee is just a barren land because after overwhelming your shrug at what to take at 24 and at 27 you can take 10 prr I guess but at 30 there is once again nothing. You'd need 4 more competitive feats to reach a tradeoff state, not 1 feat that is probably an auto-include on some builds and an auto-not-include on others.
Besides, we all know this has huge power issues. Any feat that gives +13% X and -10% Y will be broken by a build that ignores Y so you have a feat that just plainly gives 13% more dps. In magic the gathering that's the whole point of the game, but in DDO it's more often a side-effect of bugs or ill-documented animations (no active attack ever specifies it's duration, all it says is +50% damage but it doesn't disclose how much slower exactly it is).
We've already had crossbows with longer load time than attack time mentioned, and hidden mysterious speed caps.
In short, this is not the route you want to go with your feats. Just make more 'boring' epic feats and interesting choice *will* arise.
I reluctantly advise against Patience as proposed.