Your ult goes through shields. against a double shield tank on point this makes their longest cd's worthless. It also goes through terminus' absorb shield. Stunning up both tanks on point and blowing their 15 sec cd's is huge.
Inara can hide her Warden's field behind the wall (I do this often too with her). This can surprise you and get you in trouble especially if she's using the cripple card. She will take the wall down and you stay crippled exposed to enemy team.
Inara's ultimate has a long windup time so before using it make sure to be in a safe spot with enough health to survive bombardmemt. It has an obvious voice line letting the enemies know to focus you so using damage reduction first can help.
Unless you're a frontliner, keep your distance from Inara, especially if she appears to be coming after you. While Inara's DPS is relatively low, she can use her abilities to trap you close to her and force you to take her damage.