Maybe this is the horrific low standard of other BBV product but this was thoroughly passable, minus a dodgy line or two. I like what it's attempting a lot more than what it actually is, but the low budget slummy decay of the episode works in it's favor, with a character constantly pissing in alleyways and everything looking like it's falling apart. It fits the themes of decay and everything, it is nearly quite good, and it feels fresh, because you usually don't see Who-adjacent adventures filmed in such dire looking locations. For my first Stranger story, I wasn't too lost. Though the technobabble results in some hysterical lines at points:

"Yes. The Enforcers, the Custodians, the Emissaries! All part of that vile bureaucracy which choked the dimensional pathways with their regulations, because to them upholding the rule of our creation were more important than the creators themselves!" Okay David Troughton whatever you say

In terms of other madness, there's a bit where Louise Jameson randomly yells "Physical!" in the middle of a scene, which I would joke about, but two scenes later, there's a bit of a disgusting scene where Colin Baker grabs her by the hair and we get this abhorrent dialogue, which is making this go down in score DRASTICALLY:

STRANGER: I’m physically assaulting you, and you don’t want me to leave?
TAMORA: Well, maybe I fancy you.

Ugggghhhh. I wanted to make a joke about Louise Jameson yelling Physical! and the Stranger won't even let me have those little joys.
Anyway, this is the point of BBV when they're still actually trying, so it's hard to mark it down THAT poorly. The so bad it's good and the "actually fairly good" scenes in it are numerous enough that you'll likely get a kick out of it. Pretty middle of the road.