Reversing that, since Act 2 has big problems then Belial has issues even if at every single individual event he's reasonable.
Was Zoltun Kulle bad? Was his voice acting? Were his lines? How did Kulle's lines suck or be great because of Belial?
What about Magda? Was killing her any degree satifactory? What about Eirena? Or what about your companion's comments?
Stop tying Belial into everything like him simply existing as the end goal suddenly ruins the entire Act in every possible way.
That's like saying Mass Effect's story was bad because of its ending. It wasn't. The story was good up until that last 5 minutes. Just like Act 2 was not completely bad in every regard, just because the end goal fell short.
You are whitewashing.
You assume our opinion is that only Belial was badly done. You are wrong. Again.
Zultun - could have been interesting, voice acting is above par, well at least above the others that seem like jokes compared to some of his, BUT, and here's the kicker, his laughing teleport breaks everything for me. As well as the presentation...
PC - "You won't betray us once we bring you back right Zoltun?"
Zoltun - "Riiiiight. I completely won't betray you even though I am just saying that the Black Plothole is my life's work and wouldn't let anyone else play with it."
PC - "he seems legit. Let's bring him back!"
5 minutes later we ignore the fact that he's very hard to kill and just simply kill him dead for good, riding into another pointless plothole.
Adria - never trusted her, had nostalgia from D1 about her but lost it in the first 5 minutes after she appeared. It's not enough that the Black Soulstone came out of nowhere, Adria does the same with an out of nowhere solution to the randomly created problem that Tyrael has no idea how to destroy evils. So Adria, someone that i have never met before comes with a solution i never heard of before about a stone most of us never heard of, that is able to do what no other soulstone was able to do before. And Adria has a spell she does not explain or talks about in any detail or length, that will be able to do something that Tyrael thought impossible.
That is a character that we should trust implicitly? And you Melyria had friends that did not find any of this suspicious? They either didn't pay attention or they need to get themselves checked bro.
I have to say that i did not guess that Leah would become Diablo until i met Adria. I pieced everything that would happen in that moment. Except for the trip to Heaven ofc. But at that moment i realized Adria was evil, and she would employ some sort of betrayal to bring Diablo back in Leah.
Maghda... Really? the worst and possible the most worthless character Blizz introduced into this story has nothing better to do in act 2 than run around until we catch her. Why didn't she go straight to Belial? Why find her randomly in the desert. What was the point at the clever attempt the PC makes to deceive her into believing Belial betrayed her? That just felt pointless.
Oh and as a final thing because i do not want to go over to Azmodan, "master tactician", heh, what is the point of sending the angry messages to their minions that they should stop me or they will die? Clearly what kept on happening was they were trying their best to stop the PC, but the psychotic mass demon and cultist murdering nephalem kept killing them. So threatening them with something that would happen anyway seems kind of pointless don't you think?
Unfortunately shortly before the release of Diablo 3 Blizzard released their Book of cain. A compendium of diablo lore. And in that book it's clearly stated, that the 3 prime evils were banished to the black abyss, a place even they fear.
How did Adria manage to get them back from there.?... uhm... uhhhh LOOK OUT ZOLTUN KULLE SUMMONS GOLEMS!!! *bossfight ensues*
It isn't a plot hole because it was directly addressed, in a sense. Adria said she specifically spent the last 20 years trying to find and mark the souls. It was poorly explained, no detail was given, but it was said.
Also, it was the 2 Evils. Baal's soul was not accounted for in the Book of Cain.
And because they said it you have to believe it and ignore the poor explanation. Not only that but you will like it as well. See what i just did? I just turned a piss poor excuse for an explanation into beautiful rainbows. Rejoice, for all is well.