TA isn't over the top, but is IS now on par with Time Manipulation and Dark Miasma. All it has is debuffs, but the debuffs work and they work well. Finally. After X number of years.
I'd place it in the upper rank of support sets, including:
Time Manipulation
Dark Miasma (and even better, Dark Affinity for controllers)
Nature
Cold
Radiation
The thing with Trick Arrow, its not lazy like Time. You have to work for your safety and debuffs. That means, targeting, area awareness, and prioritization. With Time you simiply hit Far Sight every 2 mins, keep Time's Juncture toggled (for -ToHit) and Heal and Debuff as necessary.
Dark plays a LOT like Trick Arrow in that you have to paint your targets with debuffs. But TA lacks Dark's stealth/resists/defense, and it lacks a heal and Uber pet as well.
The only thing Trick Arrow has is debuffs. So they had better work and work well.
Some primaries will work better with TA than others, of course. I find that Water, Dark and Ice work very very well. (I have just incarnated a TA/Dark and have played with TA/Ice and TA/Water on the test server).