Well, being one of a handful of ML10 Stormlords on this server, I thought I should share my experience with this MA path with you all. As most people know, choosing between Stormlord and Convoker is not that easy; they're both rather subpar, at least in comparison to Perfector (for PvE, less useful in RvR) and Battlemaster (Grapple, Bodyguard, Throw Weapon, all useful in open RvR). Both Convoker and Stormlord are next to useless in roaming FG vs FG RvR -- the cast times of the various abilities is much too long to allow them to be cast against decent groups (some things like the BT pet might be useful, though I am not sure the pets are speeded?).
So, if roaming RvR is out, what do you use them for? To me, it seems that Stormlord is most suited for keep warfare and zergs, whereas Convoker is better suited for soloing and small groups. All the Stormlord abilities are more or less static and storm-oriented, so they are beneficial (or detrimental) to the masses (rather than the group-oriented nature of most other MA lines).
Now, about the Stormlord ML10 ability, it kind of sucks. It is called Arcing Power and makes the next damage spell you cast AoE. It has a 10(!) second cast time, 5 minute reuse timer, gives a one-shot AoE buff for 1 minute 15 seconds, and does not work with bolts, debuffs (so no AoE nearsights or body sorcs AoE debuffing ice), or single-target roots. For me as a Spirit Cabalist, I get to cast an AoE version of my base lifetap (which could be handy) -- with falloff -- or an AoE version of my base DoT. Gee, I've been a Matter Cabalist before, enough mezz breaking already!
So, Convoker or Stormlord? This depends, in my opinion, on whether you see yourself camping keeps and zerging (Stormlord), or soloing (Convoker) during the times you don't play in full groups. For myself, I still have some testing to do in RvR, but I am most likely respeccing to Convoker.
Note that these are just my own personal thoughts and I am sure others disagree with me.
So, if roaming RvR is out, what do you use them for? To me, it seems that Stormlord is most suited for keep warfare and zergs, whereas Convoker is better suited for soloing and small groups. All the Stormlord abilities are more or less static and storm-oriented, so they are beneficial (or detrimental) to the masses (rather than the group-oriented nature of most other MA lines).
Now, about the Stormlord ML10 ability, it kind of sucks. It is called Arcing Power and makes the next damage spell you cast AoE. It has a 10(!) second cast time, 5 minute reuse timer, gives a one-shot AoE buff for 1 minute 15 seconds, and does not work with bolts, debuffs (so no AoE nearsights or body sorcs AoE debuffing ice), or single-target roots. For me as a Spirit Cabalist, I get to cast an AoE version of my base lifetap (which could be handy) -- with falloff -- or an AoE version of my base DoT. Gee, I've been a Matter Cabalist before, enough mezz breaking already!
So, Convoker or Stormlord? This depends, in my opinion, on whether you see yourself camping keeps and zerging (Stormlord), or soloing (Convoker) during the times you don't play in full groups. For myself, I still have some testing to do in RvR, but I am most likely respeccing to Convoker.
Note that these are just my own personal thoughts and I am sure others disagree with me.