Summoners, we are aware of some issues currently affecting Dungeons, and possibly other parts of the game. We are working to resolve this as soon as possible, and will address the knock ons when we are sure this is all resolved.
Mysterio's specials are to cool and it actually is a problem.
As of right now the optimal way to play Mysterio is by building up to the sp3 while spamming heavy whenever you have 3 gas charges. Then you use the sp3 to increase your damage while you once again build up to another sp3. The problem I have with this is that you will never see the sp1 or sp2 in action. This is a shame because they look so darn epic! There also is not realistic way to quickly use one since it drains gas charges and costs to much power to rebuild. If anyone at Kabam reads this I really hope you can help my fishbowlboi out in the next rebalance update.