I can't decide whether or not to look forward to this.
The first game was something of a gem, but it was marred by sooooo many shoddy design decisions.
Every ten minutes there would be another thing where I would shake me head and wonder how on earth nobody involved had seen that it was a shit idea.
Have any examples in mind? Because I loved Original Sin and I can't really remember anything that I thought was egregiously bad other than the crafting system.
Well, you've anticipated one with the crafting system. Want to see what stats the item you're about to craft will have? Haha, nope! Want to control the visual appearance of the item you're making? Haha, nope! Also have fun save-scumming those randomized stats to get the one useful variant that you actually want.
The inventory system that makes you shuffle items between characters rather than just have them draw from a common inventory. Achieves nothing but a waste of your time as you search through up to four different inventories for that one bit of armour you're looking for. I realise there's a purpose for separate inventories in the multiplayer, but they need to fuck right off in single player.
There's the equipment degradation that achieves absolutely nothing except making you go through and click on each equipped item to repair, then wait for a very brief but utterly pointless progress bar for each one.
There's the item identification bullshit which works basically the same as the repairing system and equally useless.
Elemental damage doesn't scale with level so later on most of the various elemental interactions, which are the best and most distinctive part of the combat system, become meaningless. Combat loses its complexity and boils down to hitting enemies with disabling effects then checking what damage type they are weakest to and dumping a whole lot of it on them.
Ambient dialogue that repeats over and over. "No one has as many friend as the man with many cheeses. No one has as many friend as the man with many cheeses. No one has as many friend as the man with many cheeses. No one has as many friend as the man with many cheeses. NO ONE HAS AS MANY FRIENDS AS THE MAN WITH MANY CHEESES.
There's the story, which is shit. You're The Special(s) and Only You and Save The World from The Void Dragon and the Cult of blah-blah-blah-video-game-story-lol. The badness isn't the painful part though, the problem is how seemingly proud they were of their shit story and how they proceeded to frontload it something fierce. The starting area puts reams upon reams of shitty dialogue between the player and the good gameplay. You need only scroll up to see people who didn't manage to stick it out through Cyseal.
I expect I could think of more if I put my mind to it, but that should suffice.