Maokai is a bit ridiculous on ARAM right now
I rarely complain about champs being OP, but I've played against/with new Maokai a few times in ARAM and he's struck me as sorta broken there.
His new saplings are stronger in bushes, do more dmg and have a long detection radius, as well as being nearly impossible to remove (unlike Shaco boxes or Teemo shrooms). It is nearly impossible to stay out of range of their detection on ARAM.
His ult also is so wide it fits across the entire width of the map essentially.
Could he perhaps have a slightly higher CD on his E and/or R on this map? (A lot of champions have slightly different balance numbers for TT/ARAM).