The developers say they modified Mystery Heroes "to help keep the mode's casual pace intact while mitigating some of the more extreme pain points it's had in the past." Removing perks helps players clock what's going on a bit faster, but it diminishes the fun.
As part of the Steam Client Beta update Valve released on February 12, users will now be able to attach information about their hardware specifications when they post a new game review or update an old one. It's not uncommon to find negative reviews that complain about a game's performance, information that's hard to draw a conclusion from without knowing what kind of hardware the reviewer is using.