A man that talks the talk AND walks the walk. That's certainly an endorsement. If a reputable poster such as keterys has gone with this build in his own game, that's worth more than my talky talk talk.To be clear, even if it's just _this turn only_ it's an amazing power. I actually spent a feat to get it on my artificer MC Warlord.
I lol'ed when I read that power in the warlord build guide back when I was playing a ranger / warlord. So fun, so powerful that class. OP even. No action triggering two actions by allies is kind of...uber fantastic. Being able to offload many of your encounter powers in a quick burst is a huge benefit to the party, killing stuff faster (alpha strike), is probably the most optimal thing you can do in 4e. (or any edition, really).
For a level 27 power (isn't it?), it's appropriately good. Or maybe it's 17? can't remember.