4 Star relevance
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I know this has to have been mentioned a million and 1 times lol! But are 4* champs still relevant? If not then are there at least some 4*s that are necessary for certain Quests?
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My 5 stars tend to be more irrelevant than my 4 stars since most are waiting for dupes to be useful.
SW, DS, Thor, Wolvie, OG DD, and a few others aren't even around as 5 stars and are great for certain aspects.
None of my 5* are in my questing, AW attack or AQ teams
Wolverine, SW, Thor, BW.
No plans to release them as 5* and still have their uses imo
But I think CB is (or will be) available as a 5, so your choice to rank him might suck if you pull a 5 star.
I wouldn't r5 any 4 star that was good unduped without being prepared to regret it.
Others, like myself, sit in a holding pattern: I will wait until I see what direction the game is taking because I have potentially great 5*'s waiting for a dupe, and I don't want to burn resources on 4*'s unless I'm certain they will help me clear content. The risk for me is that I never dupe the 5* and items start to expire before I can use them. Or, frankly, that I lose interest in the game completely while waiting.
Your question is a valid one. I don't think the game team really understands the predicament. They blithely post about how resources will be more available and trot out high dollar offers to support that contention. They claim there's no reason to worry about 6*'s and then back door 5* block penetration into 5.3. And they wreck AW by turning it into a Item Use contest but don't significantly boost the rewards. So you have ample reason to be concerned about the viability of 4*'s.
Dr. Zola
I did my labyrinth and act5 till now with 4* only and i must say they are very handy
5* are good but you don't always have required 5* so it's 4* who do the work
Further a 5/50 4* and 3/45 5* are same.
That is a problem. Like I said, most of us are stuck in the middle.
DZ
I would also say that some it's going to be good for a while to have both the 4* and 5* versions. Magik and Hulk both come to mind here...
Don't forget both Visions, immunity and power control king!