High and fever are fine as is, it encourages PvP and rewards players for playing good.

Also, teams should lose points when they die, to not encourage yolo play AND make comebacks possible.

The 1v1v1 is fine, it's just that there are too many pugs who don't know/don't care to work with it. There are more strategic choices than in 1v1. Well, I guess that depends on how it's implemented, but as is now 1v1v1 requires more "smart" play to win. However, the practical reality of pugs on NA/EU servers makes this a somewhat moot point.