Its what you would expect really, obviously nothing like the adverts but its not the worst game ive played
Its fairly simplistic turn based play with some very basic tactics.
The graphics are decent enough for this sort of game (but not exceptional) but the gameplay is very repetitive, there is only a very small number of dungeons that you run thousands and thousands of times - often people dont even watch the runs and have mouseclickers as there is no way to fast run the dungeons. Grinding will tie up your device for hours as a result and i believe most run these dungeons overnight.
Its heavily pay to win, and the prices are some of the most ridiculous i have ever seen, as an example a sacred shard is valued at around 15 dollars, this item gives you a 6% chance of pulling a legendary character...but it gets even worse! as they deliberately make half the legendaries to be rubbish to dilute the pool, and have no system too stop you pulling the same legendary twice or three times, or four.
So that 15 dollars is actually giving you about a 2% chance of a useful new character. You can see how people can spend thousands trying to improve their account
Is it the worst game ive ever played? no - but it is what it is- a simplistic grinding game with heavy pay to win features.
Of course, like any game where you initially invest time and perhaps money a lot of people will carry on playing as they dont want to waste their 'investment' of time and maybe money.