Guild Wars is completely optional. If the current guild you are in does guild wars and you do not want to participate for whatever reason then find a guild that suits your style.
Me personally I want the best of both worlds, so I chase pvp and Guild Wars.
Also Guild Wars is not RNG there is actually a fair amount of skill and I have proven this multiples times weekly. I can't tell you how many queen mab fights I fight weekly, today alone all my battles were some form of Justice and Queen Mab.
This has actually been a good thing as much as people don't want to hear that. The reason I say this is it has me thinking with completely different strategies then ever before. So much that our guild has constructed anti-mab justice teams, and they work surprisingly well. I am using troops that I've never used until Guild Wars came along.
Each match I treat like a game of chess everything is a calculated move. Last week alone five battles took me 90 minutes but I still got a perfect 5/0 because I made the right moves.
Every team can be countered it just about finding the right team.