This is still one of the best mobile games around. The current new ML 5* in the mystic summon (Harsatti) has been great for getting back into the game for me. I don't have the gear for 300+ speed units, most of my speedy units are around 250. Harsatti is cool because her passive reduces everyone else's speed to below hers, and she always goes first (unless you're fighting a Zio). Her S3 reduces enemy debuffs by 2 turns, makes them unable to be buffed and unable to counter, and she's a mage so there's stun chance too with abyssal crown. Plus no one's CR manipulating passives work on her turn. BBK is also super OP atm, one of the original 4* ML units.
Edit: Oh ya, I forgot to mention that they're coming out with a PC client soon, which I'm looking forward to. I don't like using emulators very much, so I've just been playing on my phone, but I want to try the actual client and hope it runs smoothly.