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I was being euphemistically polite/English.
Their work was universally poor in the way you describe, in myriad different ways (wonky plug sockets, damaged bath, gas leak on the mains, not following instructions, used internal plywood outside and lied that it was marine etc.), but also their electricians got struck off the NICEIC register for having 3 x C1s on a new install (plus previous complaints from other sites), the man deducted income tax from his subbies and didn’t pay it to hmrc, so the subbies what to pay it again direct to hmrc. The police were called to the site re a fight. He tried to rip us off using a tactic that apparently would have worked under a JCT contract (we used RIBA), he lied to us throughout, and he left an open vent in an SVP behind a facade (100% deliberately) so the kitchen stank of shit until I worked out why, cut a hole in the wall and covered the vent. He left an open sewer in my kitchen.
End result -I find it very hard to trust tradesmen at all, and end up doing too much myself, and I’d now always use RIBA over JCT, and I wish there was a homeowners association standard contract that put the weakest party, ie the only non professional, in the strongest position.
Poor quality means something very different in domestic building terms. It's usually obviously defective, the kind of thing that the perpetrator is never around to discuss. It's a nightmare to manage builders to be honest.