It's all relative as well, Cairnsy
If we consider Villareal as the outlier among the four semi-finalists, then the astronomical amounts of money that have been pumped into Real Madrid, Man City and Liverpool would suggest that the least they should expect is quarter or semi-finals.
It was a different era, but the Italian and Spanish giants were all importing foreign talent in the 60's, in fact - the biggest importer of external talent was England where there were countless numbers of Scottish, Welsh and Irish players plying their trade.
At least 2 (and I would strongly suggest 3) of that Lions team were in the top 10 players in the world at that time. Big Tam revolutionised the role of full-back and was doing 55-years ago what Robertson and Alexander-Arnold are being lauded for now - plus he had a significant goal threat too. Jinky was just unplayable and could have graced any arena in the world and I would also argue that Bobby Murdoch had second-sight and the most sublime range of passing in world football in that era.
The Lions were no fluke, in fact - my only criticism is that they should have won the trophy multiple times with those players. That's being extremely harsh, but it's probably true. They were better than the Man Utd '68 side and they took their eye of the prize after beating Leeds in '70.
It's about time they were recognised throughout Britain for what they actually achieved in 1967. Football didn't just arrive in the English Premiership era, but it seems that Sky Sports and the other satellite broadcasters don't recognise the sport until they dipped their mucky paws into it.
