Honestly, I hate snapshot exploitation. Granted it is something most games use for pets and whatnot for calculation purposes and in that regard its perfectly fine and reasonable, but abusing it causes all sorts of problems. Sure it puts Ultron in a decent place, but not everyone wants to do it, or they simply don't know how. Without it Ultron feels lackluster, but if he is buffed, the people snapshotting will get a huge power spike, and therefor they probably won't do anything for fear that Ultron will get too powerful.
Is there any real way to get rid of the snapshotting? Has it been considered?
A good way to help remove the snapshotting is to make the drone's pseudo-temporary or constantly refreshing. Like say the drones last 30 seconds and come in every 10 seconds instead of being actively summoned. This would keep them up all the time but continuously refresh them to keep snapshotting from being abused.
Edit: Gaz has realized this problem and is looking into it! The post is here: https://forums.marvelheroes.com/discussion/287322/exploit-ultron-snapshot-abuse