Honestly, i don't think R2 will make droids reach top 5-10... I could be wrong though... Just need a screenshot with a Droid team with R2 in spot 1 and i'll believe they've became competitive once more. Back in the wiggs day, droids could stand against them, since then, both wiggs and droids lost their value, specially droids. But it would be nice to have an extra team competing at the top, for the sake of variety.
But as i said, i find hard to believe droids will be competitive enough for top 5-10 tier... Maybe top 20, sounds possible.... A few days more and the droid users will have a better feedback on that.