I base my love of Tactics + Gaussian's proc for the fact it has a chance to fire for everyone your Tactics is buffing, which includes mastermind pets, etc. (Unless someone's proven that not to be true? Pretty sure not, but I can be wrong) When you're in a league, that ain't nothing, and I love MSR, ha ha.
Have to admit I hadn't thought about the use of some extra accuracy when you're gonna blow a huge AoE off in everyone's faces though, that's a fair point. I suppose I could check a build for another form of BU or something before skipping.
And it's funny, I think every build always takes Leadership but many seem to skip travel powers all together now (which is fine, Ninja Run+Sprint with an occasional jet pack can do just fine, but it does get old after a bit).