Well, chalk this as the 2nd worst DB game right after Ultimate Tenkaichi imho considering they had no technology limitations this time...
- Clunky battle mechanics, no skill involved at all. Characters are slow to Guard, you can't interrupt your attack to suddenly block and you can't block/interrupt if someone has started an attack on you; the pace is all over the place from fast to slow to "why the **** is my character taking 2-3 seconds (literally) to turn around and face the enemy that just blew past me/dodge/changed lock to?"
- Lock-on is downright annoying, in fact it's a struggle to even face the opponent the right way. If you face the wrong way and keep mashing buttons, you will continue to attack that way until you stop, after you stop for 2-3 seconds, your character will finally turn. No words to describe...
- Controller bindings are unintuitive. Block on LB, who the **** thought that was a good idea? Separate button for Vanish/Teleport.... seriously? L3 to descend and A(Xbox) or X(PS) to ascend, wtf? In some places you use A to interact while in others you use B, cos **** consistency?
- Limited amount of skillsets. You can only have 4 Supers (including Rushes and Utility), 2 Ultis (Transform/Powerups are Ultis) and 1 Ulti Escape/Interrupt thingie. So you learn all the techniques in the world but you can only use 7, cos **** logic.
- Less combos than ever and every character has the same ones but with different animations
- No signature moves per character. Like seriously, I get this game is made around the idea of Customizable characters, but each race should have at least 1 signature move... They have unlockable ones for certain races (2 at most, don't get too happy), but guess what, Frieza race doesn't have any specific ones for some reason (looked through all), while 90% /220 total (no exaggeration) of items are cross compatible with all races.
- The scouter item discovery is badly implemented. Sends you to 1st Person but you don't have time to look around in a fight at all, plus you can't fly fast, collect things or run when using it, successfully defeating its purpose and making it an annoyance.
- The free roam area is incredibly stupid and I want to expand on this a bit: you can jump but there's nothing to jump over as you get stuck on every object you would try to jump over Eg. bench, you can't fly for some stupid reason, you can't run for a reason beyond stupid, the drawdistance is pitiful at most so everything just looks like a rough sketch until you get up close, the whole free roam area basically shouldn't exist, it would of just been easier to make an interface which would spare us a lot of time wasting. (This is on PC as well! I dread to think what it looks like on consoles!)
- Dialogues with NPCs are a bleeding pain to all my senses (except smell probably)
- Only Saiyans have transformations for some reason, even though I can think of 100s of ways of making all classes transform. Eg. Majin transform can be easily narrated in using those time distorting guys to try to make him evil or something, Humans can unlock their potential to Mystic through the Supreme Kai of Time, Namekians can have like a choice to split bodies early on and have an AI bot do parallel bodyguard work and choose to merge at some point (easily narrated in), Frieza can just transform upon reaching certain levels. Point being, if I can think of ways to implement transformations for all of them, it can't be that damn hard to have been done.
- Maps are still ******* small and there's virtually no destruction, apart from some very short lasting decals and average sized rocks that take ~5 Ki blasts to blow up at any level which makes no sense...
- None of the Ki/Physical moves have any impact behind them and stamina is just a ridiculous inconvenience that could have just as well not existed and everything would have been fine.
- NO POWER STRUGGLES??! WHY??? You clash with someone and you just get a little cinematic (which never changes btw) after which you just break up like a schoolyard fight and land away from each other. No analogue spinning, button mashing, head-nodding, nothing...
- Don't even get me started on the item drops. The side quests (Parallel Quests or PQs) say they drop these good Abilities and Armour, but in truth, they are random drops. A small search on the Internet will tell you how many people haven't got the Raditz armor promised in one of the first PQs even after doing it 10 times or more.
-Terrible Tutorial that barely teaches you basics. Had to ask the robot outside the Tutorial, which serves some basic information as pictograms, which one was my Stamina Bar and which was the Ki bar as it's not clear. Nothing and noone teaches you Rushes, or how to follow-up on combos/vanishes.
All bad points I can think of right now, I might edit some more later. There's also good points but not enough to overshadow its downfalls. It takes more steps backwards than forwards. To me, Raging Blast series was still the best presented DBZ and a true continuation of the Tenkaichi series. This game is basically a very bad attempt at an MMO. If it wasn't digital only I would throw my poo at it. (yes it's a monkey reference)
Conclusion: They made the game fast-paced and multiple enemy orientated, but don't give you the tools to react and deal with that.