I'm not enjoying these high level battles.
Basic attacks and strike supers are useless. I just keep flying in circles shooting ki blasts and eventually a final flash.
My earthling was suposed to be a melee character but soon i discovered melee wasn't effective.
Or am i doing something wrong?
Last PQ i tried was one given by Goten. I can beat him and Trunks easily. It's a fun fight as i can use all my arsenal against them. No bullshit. But then it's Trunks/Vegeta turn. Super sayan ultimate spam bullshit time.
Basically, with 1 vs. multiple opponent fights, everyone, even ranged, generally end up ultimate spamming because that's the most efficient way of doing damage while being invulnerable. It's not a problem specific to melee characters. I haven't done the higher PQs as melee yet (my character is a ki super saiyan) but here's two videos with this same ranged character doing PQ32 Super Saiyan Bargain Sale (similar to the Goten PQ just less rounds and lower level) with melee skills with ultimate spam and without (although I fail without but, if I had all points in melee stats, I would have probably beaten it: currently have 0 strike supers and 18 basic attack at level 54-55).
Edit: For the ultimate spam, you should bring skills that can deal with that. I recommend Super Guard (drain your ki slowly but makes you immune to everything) or Change the Future/God Breaker (blocks supers/ultimates and teleport into their face/behind them for a big attack) and the escape move Instant Rise which teleports you in the direction you're pushing to get out of ultimate spam.
Melee with ultimate spam:
https://www.youtube.com/watch?v=-wv3ZViRnOg
Melee without ultimates:
https://www.youtube.com/watch?v=ZpikwoAgOyk
Also, for super armour, the best strategy is still using ultimates to bring it down (such as Victory Rush which hits enough times to break the armour) but, if for whatever reason you don't want to cheese it like that, you need to be willing to pour all of your stamina into vanishing to continue the assault until you break the armour. You then need a way to quickly replenish your stamina to prepare for the next round (or be ready to use an ultimate since now you should have a ton of ki from beating up the AI). I don't know of too many 1 vs. 1 super armour PQs yet so I made a video of PQ15 Explosion of Namek which has a super armoured Frieza. Basically, I bait the AI to attack while I block and use vanish for only 1 stamina bar to start combo'ing from behind then vanish when I start getting hit and keep striking until I break through. I use Super Drain to get my stamina back and can just keep going like that. Ideally, I would side-step the AI's initial attacks but I'm finding it nearly impossible to do on keyboard/mouse which is a bit of a shame but, with enough stamina, the block-bait is good enough of an opener.
Frieza super armour as melee, no ultimate:
https://www.youtube.com/watch?v=_Gqg1f9s8cA
For 1 vs. 2 super armour (near end of story mode character spoiler)
, yeah, ultimate spam is, I think, the only way since you can't disable either of them so you'll constantly get interrupted.