I choose to run all Jedi+5's, instead of boring old Rey and RG etc.
In arena and GW I run IGD lead (for 35% counter chance), QGJ, Aayla, Fives and Lumi. the whole team is decked out with health+defense mods, with the exception of Aayla who uses crit chance mods, so she stuns whenever she counters with a chance of an assist! . Strategy is high defence with numerous counter + assist attacks. Whenever a enemy damages all targets against this squad the counter attacks wipe them out completely- I cant think of any other team that offers this.
I would say this team does really well and It can handle most situations - however it can get pretty tough when you put them up against the typical maxed out Old ben, Rey, Royal guard set up.
Once I have my Jedi's maxed it should make these enemies a bit easier
I also have:
Ahsoka : Hits really hard +self heals - I've found she gets wiped out easily though
Mace Widnu : underwhelming most of the time
Yoda: can be pretty handy sometimes - however his health+protection is pretty low, even at 8* gear 9 with mods.
Havnt got Anikan yet but have heard many good things - might be worth the investment