Yes, they had avoided most of the problems of some of the other TOCs until recent weeks.
Of their overall timetable, the changes are a pretty small percentage at the moment: this is not yet TPE/Avanti. I mean, irritating if it's your train but it is 9 cancellations and 7 short terminations today, for example. I guess we watch to see if it gets worse.
It's not Avanti or TPE territory *yet*, but even if it doesn't get that far, the regularity with which the ECML infrastructure seems to collapse will see the overall perspective of the service on offer from Joe Public sink lower and lower.
The other thing that won't help that perspective is that I'd think a good majority of passengers use the specific Anglo-Scottish LNER trains that they do for a reason. It isn't as simple as "oh bollocks, I'll just get the next one" as it may be to more of a degree with, say, Thameslink or Northern.
Those passengers affected, which will be thousands per day, are more likely to say "useless LNER couldn't be bothered to run the train I've paid £100+ for, I didn't get any seat or the seat I'd booked for a 4+ hour journey, I won't bother with them again".