With the introduction of Shadows of Mirkwood, crowd control effects (CC) in the 'moors have reduced effectiveness with every application.
Per Frelorn in http://forums.lotro.com/showthread.php?p=4107893#post4107893
Changes to CC Diminishing Returns
All crowd control effects (fears, roots, stuns, and dazes) are now on the same application counter. This means that for purposes of diminishing returns in PvMP (and in PvMP ONLY), each application of any crowd control effect is counted against the duration of the type of crowd control.
Update Vol III Bk1: CJ's are now affected by dimishing returns on their own separate counter.
For reference, the duration tables of each crowd control effect vs. application counter are below:
Roots/Dazes
Stuns
Fears (please note that this applies only to crowd control fears - this does not apply to debuffs with resistance type: fear)
Conjunctions
For an example with this application counter change:
You are hit with a daze effect in PvMP. It is counted as the first application of a CC effect, and the daze effect duration is 50%. After it wears off, you are then hit with a stun. It is counted as the second application of a CC effect, and the stun effect duration is 50%. After it wears off, you are hit with a root. It is counted as the third application of a CC effect, and the root effect duration is 5%. After it wears off, you are hit with a fear. It is counted as the fourth application of a CC effect, and the fear effect duration is 1 second.
Please note that the diminishing returns application counter is not permanent - if you are not hit with any crowd control effects for 45 seconds, the application counter will reset.