Hit rating and expertise are the life blood of the max level PvE death knight. DPS death knights need exactly 7.5% hit rating and 7.5% expertise to avoid missing raid bosses or having their attacks dodged outright. Even tanks, while a miss is less of a big deal for them, may find hit and expertise helps them keep threat and prevent key debuffs from falling off the mob. They're so powerful that if you aren't near those caps, your DPS will suffer horribly, and in most cases, the one thing you do to increase raid DPS is to hit those caps if you aren't at them already.
Now, this is what we have reforging and regemming for though, right? Sometimes it's just not that simple. Today, we'll take a look at the problems with hit gear and suggest some solutions.
The big problem is that once hit and expertise do their job of letting you hit the mob, they are almost literally useless. Dual wielders get a little bit of extra help for their normal weapon hits, but 2 handed wielders get literally nothing else out of them at all. They're dead stats. Arguably, it's bad even if you are at the 7.5% caps, because that means you have a bit of hit and expertise. and expertise rating that's not needed for daily questing or dungeon runs, or even for most raid trash.