The start is defo not as easy for us as it is for other classes. During the leveling process we did most of the dmg, then you hit 70 and quickly get 6 set pieces and the other classes start to do massive burst dmg while you are left with a DOT playstyle.
25% boost from burning enemies, 600% from elites. That means you need to get them burning 1st, while others just did the boom dead thing. Did feel like I was getting carried in T6 etc for a while there.
Steadily I climbed in power as I geared and then things changed when I was able to play DMO and then with the farming build. Was a more steady climb to power than other classes seemed to have had, but was worth the wait and very rewarding and fun play styles imo. Brings back memories and I'm happy I went back to my roots with the Wiz.
Set drop was few and far between for quite some time. Thought I was cursed as the only set items I had well into the game was the 6 FB's I received while others already picked up tons.
Then from Sunday/Monday things started to go better.
Agreed, Wiz really has the short end of the stick when it comes to the free set. And like you say, they have to be burning. Not just the initial dot, but the actual infinite dot that gets activated when enough damage has been done.
For most of T6, that is actually the point where the mobs die, so we have practically ZERO power spike from the set. The set only shines in GRs where white mobs and elites will all live long enough to activate the dot and burn for some time. That way you can keep kiting burning mobs towards the next pack and keep some kind of damage scaling going.
But by that point, the other sets tend to outshine it on GR pushing. And if you want to take it into T10 where the mobs might burn for long enough, you have to first get hold of a whole host of other uniques that scale your own damage reduction, so that you can survive the beating until you get them burning.
So firebirds really is a strange set.
Most other class sets have their defenses built into it. Which should have been the natural choice for the starter set. I think teh Archon set would have been the better choice.