So. Huge fan of Borderlands here.
And I think BLTPS is a really bad Borderlands. Especially the writing and what they did with the old characters. Also the new characters are meh at best and they didn't get the humour right. And I love Borderlands 1 & 2 characters, the writing, the dialogues, the humour... they're fantastic. BLTPS tries too hard and misses. Feels childish and immature, just a wannabe copycat of BL humour.
The writing is my main gripe. But it's a bad Borderlands for a lot of tiny little details.
Anyway, while being a terrible Borderlands, it can still be a pretty decent and fun game. Not for full price (feels more like a big DLC), but it's not money down the drain.
Said so, I played a bit of the Holodome. And while I loved Moxxi's Underdome... it's really, really boring. I tried it at a friend's place and I almost fell asleep on his keyboard.