So I've been playing this game a lot until February last year (that's what steam says anyway) - got several lv74 chars with not-too-shabby equipment at that time. Have all the new DLC now thanks to Humble Bundle. I don't exactly remember why I quit but I think it was because item upgrades were basically only found in advanced survival waves. Now.. I don't really want to invest hours before there is a chance for something good to drop, even more so because the gameplay of those early waves hasn't been challenging/fun either and wasn't even good for leveling.
Is there more to the endgame now? Can I just play for say 30-60 minutes and have a chance on very good drops? Or is there a way to fast-forward waves?