I picked TJ and am planning to spec out of it. I'm a lvl 25 now.
My issues with Time's Juncture:
1) Short range.
2) The debuff is of a short duration, which means I have to spend more time in melee than I would otherwise like.
3) It's expensive endurance-wise.
4) It draws (often unwanted) aggro.
I don't mind moving in to melee range to cast a PBAOE, but at least let it have a real duration like Temporal Mending does. I can Hover in, cast Temporal Mending, and Hover right out. Same for Flash. Time's Juncture REQUIRES that I stay in melee range. Almost as soon as I leave, the debuff is gone.
When I get ambushed, I cast Flash, and then I unleash the Blinds, Deceives, and the PA. Once the wheel begins to roll, enemies rarely survive very long. Time's Juncture simply doesn't help much.
It's also expensive when combined with Superior Invisibility.