While abusing Laser Shot is the way to get ahead with Ion, you better hope that you are at a reasonable distance while doing it and not on your own. Without cover and on low energy, Ion has a pretty horrible defense to compensate for her offensive capabilities, which is the main reason I defend her as a Titan. Using your energy for two shots forces you into hiding INSTANTLY because her weapon has a hard time dealing damage even against pilots.
With the exception of Legion, her shield is next to useless against any other titan. Tone will hit you with his 40mm, Scorch will tank your shots, Ronin will be up in your face, Northstar will be at the edge of the map. Not to mention VS gets drained in 1 second against Salvo Core and Laser Core.
I also don't think she is a better sniper than NS. Not even close. NS's plasma railgun has a ridiculous range. Ion's Laser Shot also has range but nowhere near as big as NS's.
Besides the obvious zoning capabilities, the best way to use is when a titan is up in your face. Toss it behind him then punch him into it. You can also walk over your own tripwire.