
Your win rate on Shiv is only 41% against an average of 54% (32 matches). This is an observation from your matches, not a verdict.
You win 57% of short matches (under 30 min) and 44% of long ones (40+ min).
When you die fewer than 6 times your win rate is 81%; more — 26%.

With Healing Nova your win rate is 73% against an average of 54% (44 matches).
compared with the average player on the same heroes; the middle ring is average