I think that the engie is one of the best additions to Legions yet. Not only does it allow players with bad ping to be able to compete, but also helps those who are not that skilled at MAs. I think these two things alone make Legions a more friendly game for beginners possibly.
Also, with turrets and such being around the enemy base, there is a whole new level to LO that will add greatly to strategic gameplay.
One thing I did notice was a bit over powered, was the guardian turret. It fires so fast that i couldn't do any damage to anything. I think that is is great for rendering long distance spamming pointless, so perhaps there could be a min/max range. Once inside this "bubble" the speed is lowered or it simply does not target?
these are just some ideas.