Had my first two hours on a PS4 Pro and it was the worst splitscreen experience, from a technical point a view, I've ever had. If I had paid for the game to play it in splitscreen I'd be mad. Favoring resolution runs the game with 20-25fps, favoring performance with 30fps. It's not Horizon: Zero Dawn or Uncharted 4 like 30fps with ultra-smooth frame times, though. Mini-stutters everywhere. Then the whole game mini-freezes from time to time, and all the time when one player is using the inventory. Everything's sluggish and laggy, it makes the game almost unplayable in many scenarios. Even selecting a skill tree is delayed and sluggish. The way the value number of items in the inventory is changing also makes it hard to quickly assess your item's value.
Then the image quality is the worst I've seen on PS4. And this is no hyperbole, I mean, literally I've never seen such bad IQ in any current gen console game. There's like ZERO antialiasing. Everything's jagged and shimmering. Favoring quality just bumps the res a bit, but still doesn't do anything about the edges. Then there are some texture pop-ins as well.
There is also so little environmental reaction. When I look at things going on in Borderlands 2 on PC with PhysX, it looks phenomenal. And especially after finishing Control where everything is so reactive and it's even fun to miss enemies, Borderlands 3 looks so OLD.
So, to conclude: splitscreen on a PS4 Pro with half the resolution, 30fps in performance mode, no AA at all, frame times all over the place, mini freezes in normal gameplay and at all times when one player uses his inventory/skill tree, and also delay in selecting things in the inventory and skill tree. This so far below any standard.
That being said, I couldn't try singleplayer on the PS4 Pro, though. For people not playing splitscreen I do hope it runs and looks better by a huge margin! Gameplay-wise I find it more fun than BL1 and 2: your character can finally climb which makes traversal much more fun. I didn't stuck at tiny things like in BL2. Finally the protagonist is voiced and talks to NPCs; I can't stand silent, lifeless dolls. Co-op action itself was fun but was constantly hampered by aforementioned technical issues. First characters I encountered were great and fighting goons with other people is generally fun and some weapons sure are awesome. I could imagine playing this with 60fps on PC, but right now I don't want to spend full price.
What I would have wanted, after playing hundreds of hours games like Diablo 3, is an optional salvage and crafting system. Don't just let me pick up the loot, compare it and equip or sell it. Let me do stuff with unnecessary stuff. Let me re-roll specific traits, let me customise my weapon in stats from all the crap and loot I collect on the way. The simplistic approach is totally fine if you want to beat the story, just like in Diablo 3. Pick your weapons you find most fun to play, equip a better one when the need arises and just have fun. But as someone who likes to tweak his characters AND items ad nauseam, it is a bit too simplistic for my taste and I'd love to do more with my equipment. I have to say that I can't tell for sure because I only played for two, three hours tops, but according to what I've heard about the game there's no such thing. I wished they would have done more so many years after BL2 instead of delivering "more of the same". Not saying they should have changed their whole formula but merely expand on already existing ideas within the genre and incorporate it to offer more viable gameplay options that won't limit the fun gameplay people used to have in BL1 and 2.
Overall I think I'll get the game once it's available for around 30 EUR.