score:5
I flew with LOT last summer from Tbilisi to London via Warsaw and then back. At no point did anyone even attempt to weight my carry on backpack. They asked me whether I had any carry on - I showed my backpack over my shoulder - and they just said, "Ok".
My bag was probably at or slightly over the 8 kg limit.
That said, it really depends on how unlucky you are. In my experience they were very lenient, but that was almost a year ago and only in my specific experience.