OHMSS, the Bond that everyone forgot.... and it's really a shame. It was also made in 1969 and I hate having to press the spoilers button... so the review is going to be hard and... really? It came out in 69, everyone had a chance to see it already... but whatever.
Lazenby, had he continued, could have carried on the Connery Era Bond into the 70s. He still had a few Moore Era tropes, a joke or two that was clearly very Roger Moore, but his delivery, his persona, his very being were far more Connery and the cold blooded assassin would have continued, with only a momentary glimpse of heart that, we know, hardened him in some ways.
It certainly sets a gold standard among 007 films and lays out some VERY important background that disproves the new "James Bond is only a title and not one person" argument that some people are making in order to rewrite the character entirely. Background that is revisited in Dalton's Era, thus cementing 007 as one person.
Connery is not 007 anymore (and they address it in a 4th wall breaking joke from the start) but his persona lives on in OHMSS. This is probably the last of the Classic Connery Era Bonds, discounted because Lazenby is in the title role. But the mood, the character, they are all still there.
This is truly the last Bond before the Era of Silly Bond started.