Oh, I have feelings about this. Oliver my sweet precious hero friend.
Cons:
The idea that the Monitor has just been testing Oliver to get him ready for his final mission is... kind of silly? I don't know. Is this just me? It feels like what's really going on here is that they had to fill out a whole season, but needed to tread water until the actual "Crisis" plot thread could take over.
Pros:
This episode felt like old-school Arrow in a way I really admired. Oliver having to balance his public image as an important figure in his community, with his vigilante identity. Oliver going to a glitzy event and then having to don the suit to stop some bad guys. Oliver getting advice and help from his trusty side-kicks, but also learning a humbling lesson about his own limits. All very early-season vibes, in a way I really appreciated.
This is a Groundhog Day episode, where Oliver is stuck in a time loop that seems to reset when Quentin Lance is killed. Turns out, Laurel is also in the same loop. This is a pretty standard setup, but one thing I really liked about it is that first Lance, and then Diggle, both believe Oliver right away when they're told what's going on. As they both point out, their lives are crazy, and include time travel and resurrections and all sorts of bizarre crap. Why shouldn't they believe Oliver in this situation? They both have reason to trust him on something like this.