I have a love hate relationship with Wrath and Archon for that matter. This is a topic that I felt I should at least comment on since it's come up on many occasions. There is no fundamental flaw with having a 2 minute cooldown ability that transforms your character and is really powerful, the problem is when it becomes a forgone conclusion that these AWESOME abilities are up 100% of the time and instead of being excited that they are up you are annoyed when they fall off. We have talked about what if anything we want to do with these abilities in the long term. I will say we have no short term plans to change them but we don't like that they aren't fulfilling their original purpose which is to provide a really awesome button that mixes up the tempo of combat for a small window of time.
You can't compare WOTB and Archon uptime as simply.
WotB gets prolonged by simply swinging. For Archon to get prolonged, you have to actually KILL something.
Look at my profile (the EU one...). I have a Wiz with 320k DPS, about 500k EHP, and 24% movement speed.
With that gear, MP5 is about the max at which I can reliably count on Archon not regularly "going out" on me before the cooldown is over - on extremely mob-intensive farming runs, that is (other than that, it's of course simply unsustainable for more than a few additional seconds).
Starting MP6, it already "goes out" on me before the wooldown is over in close to half the times I activate it (once again, this on extremely mob-intensive farming runs). Simply because I just can't KILL mobs fast enough anymore to compensate for the stopping of movement (I do have to stop moving to attack) and the mob HP going up.
I get what you mean when you say "100% uptime always" shouldn't be the norm for the skill. I totally agree
. What I'm saying is, having significant uptime on not-very-low MPs, even MP 5-6, is NOT AT ALL something that is easily achievable. And it does scale with MP, with it being almost impossible to achieve on extremely high MPs (8+).
Now, take any comparably geared barb with WotB/ToC. He'll be able to sustain the skill on MP10, no problem. It doesn't matter if 20 seconds have to be spent by kill, because uptime is awarded JUST BY SWINGING. It's actually EASIER to get WotB/ToC uptime the higher the MP is ! Not to mention the fact barbs usually don't even have to stop to attack (WW+Hurricane run).
My point is : I don't know what you are planning for the future, and I'm not trying to advocate one specific change over another. I'm just saying, please don't put Archon and WotB/ToC in the same bag, because they're not. Their uptime mechanics are fundamentally different, with fundamentally different consequences.