Mei can nullify it too with her ice block. The tanks can survive it if they are at full HP, Zarya especially with her self shield. Also, you'd have to actually manage to sticky them on your target, I found that the speed in which she throws coupled with lag and whatnot to be EXTREMELY hard to sticky it on a moving target. You'd have to pretty much catch them by surprise in order to get the stick on them.
All in all I just don't find her ult as satisfying as the others. I like saving the entire team from a wipe with Lucio's sound barrier ult when a Reaper/Pharah/S76/Juntrat/Roadhog uses their ult, or insta killing 5 people with my Hanzo/Reaper/Junkrat/Pharah/Torb ult, or saving my entire team from a wipe with my Mercy ult.
Tracer is definitely one of the most fun heroes to play for me, it's just that her ult by comparison is no where near as fun or as good as her blink or time warp abilities and usually with the other heroes it's the opposite, their ults are a cool thing I have to work for to build up and then finally get to release. With Tracer it's like... "Eh, her ult is up.... I guess I'll use it..."