Nexus Blitz opinions
I think the biggest issue in Nexus Blitz is the Statik Shiv buff. You never know when it's going to be the prize, but which ever team gets it is going to win 90% of the time... even if way behind. The quick clears in all lanes, incredibly easy rift defense and godly end game pushing power it provides out classes any other buff.
On the other end, the GA buff rarely impacts anything lasting 90 seconds. Most team mates don't get together and pick a team fight or big fight while they have it or play any differently, then it's gone and they die and complain it "didn't work."
I was just 13/5/22 in my last game and we were destroying the enemy. One bad Ring of Fire placement and the enemy team wins a challenge and it's Statik Shiv buff reward. They end the game in under 3 minutes thru their overwhelming push might from behind. I've also had games where the ahead team surrenders immediately if that buff goes to the behind team, and vice versa honestly.
IMO, it needs a longer charge time as a buff or it's damage tuned down when it's an all game, all player buff that has such a massive impact.