Gilmok here.

I play DP every day between 7pm and 8pm PST. I can solo kill a Death level Blaze Crowd boss in about 5 and a half minutes. Use skip to basically treat it like a button mash fest.

DP does require some commitment to get good cards - the best cards are actually from the Zodiac Shrine (which requires guild participation in week long raids - you get a few zodiac orbs that allow you access to the stages). If you're just starting out you're not likely to get anything good from any of the gachas - LRs are an extremely rare drop and can only happen on Rare tickets or SR or better tickets (raid gatcha tickets and "points" tickets only drop sac fodder for SSRs and LRs).

FYI, the two Zodiac cards you need for Blaze Crowd are Aquarius and Aries, with Aquarius being the most essential. Sagittarius is also helpful to get your times down faster. I just start in the back, use the Light square, use Sagittarius to boost myself to 40m. Then I go to the front, use the water square, use Aquarius to boost myself to over 500m and kill all attack spots. Once the water square expires, I use the wind square, and use Aries to kill off everything else. (Now that my water square is up to level 8 I actually get to over 1bil power while the water square is going).

DP's interface is cluttered, but once you figure everything out it actually plays quite quickly. Just go to a quest and full power it. All your AP gone and your progress advanced. And you want every last of AP you can get.