Sue has done a lot of work for me and is almost as auto-take for me as Johan, one of the most powerful models in the game. Now that Return Fire is an option it improves Sue even more, as it makes it much more worthwhile to spend a decent crow on defense or WP. I've had Sue do 10 damage to a Sabretooth Cerberus outside of his activation (albeit with a lot of luck as he was at - to defense) and I've had him use his auras to mess with casting crews or deal decent amounts of burning damage to models that want to get in melee, as others have said he's so versatile that it's hard to find a situation that he won't be useful and sometimes he can punch above his weight class.