Only welding half a rod as a bead in the flat position, is no basis to form a proper opinion good or bad about any electrode.
I agree that welding a bead on 6mm plate is quite easy to get right but that's exactly the sort of demo that many people put forward here when enthusing about, or criticising, various welder/rod set ups. I suggest it's not unlike the tests which Muggins did.
I also agree it's not much of a basis for writing up a five star review along the lines that Lidl rods are probably a 'best buy, highly recommended.' That's my present hunch, though.
There's a world of difference between (a) pouring praise on something or somebody, on the basis of very little exposure or evidence, and (b) damning the item or person as 'crap' and 'cheap rubbish' as Muggins says. His tests are minimal as well. Nobody much minds (a) but all hell can break loose if you go around making critical comments as in (b). I think we owe it to others reading these threads to be more careful before opening a thread about 'bad rods' where the main focus was Lidl rods.
Also, was the price range you quoted for the Lorch H140 inclusive or exclusive of VAT? And what is the duty cycle when the H140 is run at its maximum of 140 amps?