Je rezzes and heals, too. And he is super speedy.
With a taunter, rez can be very useful. Poe or han will give an additional tm boost. Rg is good too. Je is pretty great against speedy teams.
I have found it useful to bench je and go with two tanks against an equal je droid team. Forgo the coin toss and weather the storm. Then focus fire them down. But for the most part je rocks.
With je, u go first. And i find it best to focus fire enemy tanks. And hope hk and 88 aoe will block their rey and or detaunters/stunners. If i can block qgj and rey, by the time my rg or han taunts, it is usually a win.
I have 5 star ig100, but he doesnt bring enough to the table, yet. Maybe when he is 7 star? Topndroid team on my server uses ig100, and it is hellaciously good, so i dont count out magnaguard.