Since you asked, absolutely: the norbogs (and ghosts) that burrow in the middle of a fight and just sit there, when all you want to do is kill them. It's basically forcing you to just stand around and wait for it to pop out, and needlessly lengthens the fight without really making it harder or more interesting. I hate quests involving norbogs for this very reason. The ghosts don't seem as bad, and the wolves in Forochel that stealth don't bother me at all (partly I think because the time they're gone is much shorter).
The one exception to this is situations where you're fighting multiple mobs; the burrowing forces you to switch to another one and then back when it returns, which keeps things slightly interesting, but not much. If I could suggest a change, I'd say shorten the norbog burrow considerably, or get rid of it altogether unless it's either a) only when another creature is in the fight or b) when it's combined with a heal. Or make it much easier to interrupt; usually there's not enough warning or induction to prevent it happening.
There, that's my pet peeve.
About them, what I would do is prevent them of using the skill if they're less than 50% and let them move while underground.. then call friends to their aid. That'd be awesome..
[charsig=http://lotrosigs.level3.turbine.com/0520a00000016e816/01008/signature.png]Anumiel[/charsig]
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