I do know, because such feats, items, class features, whatever already fail for me right now.The trick is... you don't actually know that. You certainly think that.
I hate everything that doesn't quietly vanish into the numbers on my character sheet and I don't have to remember ever again.
Weapon Focus is fine, all my attacks go up by +1 damage and I don't have to think about it ever again. A feat that gives +5 damage vs. prone enemies is terrible for me, because now I have something I will simply forgot 90% of the time I am attacking a prone enemy.
My favorite items are Belt of Vim, Circlet of Indomitability and Boots of Quickness. I have made the "misstake" in LFR to take a Circlet of Mental Onslaught instead of my desired Circlet of Indomitability, because it's basically the same plus a neat power. I got the item 7 LFR adentures ago and I have never used the power even one. Not because it would not have helped, not because I did not have the action to spare, simply because I forgot I actually have it. The closest was remembering the power when it was not currently my turn and then having forgotten it by the time it was my turn again.
I would look for feats that make my character better at what he's supposed to do and doing so at the most "boring" way that requires the least tactic/remembering on my part.Would you look at the feat options and decide to try _really_ hard to milk out a +3 from some combination of 3 feats?
A feat that only works when I charge would be something that I would not take because then I would have to find a tactic to charge often and to use different values when charging and when not charging.
I do not use frost cheese because it's cheese, but because I consider it too complicated for me to enjoy using it. Having to remember to change all my attack and damage values depending on whether or not I hit last round? No, thank you very much.
So I need simple feats that still improve my character in his job. There isn't much left except for simple increases in hp, defenses, attacks and damage