It can work, but certain things can shut it down (putting Wat with DR/Malak) and some teams wipe the floor with it (Padme, Jedi Revan). The reason it works so well against Sith Empire is that T3's Combat Logic zeta takes advantage of Sith Empire stacking tons of debuffs on themselves. Said debuffs also shred their defense, so you're hitting for massively inflated numbers.
You can't go wrong with getting Commander Luke. CLS/Han/Chewie remains one of the best offensive teams in the game.
I was really hoping to get CLS the last time he was available a few weeks ago. Sadly, my ST han was only 5 stars and I didn't have a good enough empire team to get 7 star R2. I guess I can work on farming that again. Seeing as emperor's demise comes back at the end of the month and I have a ready 7-star phoenix team, I can get my EP to 7 star and with my new 7 star thrawn I'll have a pretty good empire team. After I'm done with ST han in the squad arena store though I'm going to get HK-47 so I am ready for Darth Revan.