The game is great for playing in dead times or if you just want to zone out. It offer challenges and entertaining interaccions between the “minis”.
If you take it as what it is, it is pretty good. Has the standard in-game shop (typical of this types of games) but so far it doesn’t feel a play to win.
Blizzard didn’t reinvent the wheel with this game, but I find it more aesthetically pleasing than other out there.
In my casi I have played it on an iPadAir last gen and a Huawei 5T Nova (yep, 4year old phone) and works perfect. Smooth and no issues at all.
PS: for other comments, remember to note that issue with one single model of device doesn’t make the game bad. Give time for the game to be optimized for it…