h4n1s wrote: There's one more point to that - it depends on your preference. If you are strictly PVP player than yes, there's not much use to level up many 3*. If you like and enjoy PVE though, that I still see a lot of pros in leveling up multiple 3* characters as often they are boosted and when boosted even mid tier 3* may unleash hell on their opponents and suddenly become fun to play with. So if you like a bit variety and tasting different strategies than it may be a good option for you to choose more 3* and level them up.
onimus wrote: I think leveling 3 stars that work well with your established 4 stars will work out well in the near and intermediate future. It takes forever to farm up 4 star covers anyway. I have a 5/5/3 Xforce at level 245. A 3/5/3 Nick Fury at level 70 And a 2/1/1 4hor at level 70. I have a 3/5/5 IW at level 70 too, but she doesn't really count. I'm currently leveling Deadpool, but after that I think I'm just about done with 3 stars. I may level Blade, who I have at 3/5/5, but it may not be useful anymore, I don't know. I already have plenty of 3 stars. We'll have to wait and see what happens with 4 star releases this year, as well as, hopefully, an IW buff. And a pretty significant one at that, hopefully.