Maybe we can start a list?
List of addons which need fixing!!! (*updated* /15 )
VPbreakdown - don't work with current VP system
RES - shows only "!" in the Addons list
Squared - don't update fast enough
Restell
HealGrid
WCST - don't work
Assist - don't switch the target ( maybe related to Assist in game feature not working ?) So I guess add this feature to "assist" addon + fix it

State of Realm
Dammaz Kron - don't track kills
RvRStats
some addon suggestions:
notify when assisting more like addon "res"... I don't think assist is working in any way atm so..
AM mech assist - suggest abilities depending on your High Magic/Tranquility
don't hit tanks - makes sure your cycle targeting don't acquire tanks
auto accept res + respawns - make sure you don't miss a ressurection
Tactic-sticky - save tactics (maybe like Goblin Closet?)