the 2 problems of nexus blitz
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events just overall ruin the mode due to the RNG in both : Their placements on the map and the reward, its no fun when you win an event and get literally nothing out of it (ocean drag, cannon of champions), then the next event spawns in the enemy base and they get free GA's/Or the Janna shields.
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mages are beyond overpowered on this mode, adcs/bruisers/assassins are mostly weak, the team with most mages pretty much wins as long as you balance your comp a bit with 1 tank or support (best comp probably being 1 tank 1 support and 3 mages).