That said, the first crossover event between Flash and Arrow during Flash's debut season and Arrow's third season was lackluster. The two episodes really had nothing to do with each other. While it was fun to see the two series crossover, it wasn't much in the way of a continuing event. This year's crossover is an actual two-part event, but it's also functioning as a backdoor pilot to a third series, Legends of Tomorrow.
None of that is my biggest problem. My biggest problem was with the portrayal of this guy: Vandal Savage. My issue isn't with the character himself as I'm not really all that familiar with the comics, but I am concerned with how he's supposed to be the primary villain on his own show when he wasn't all that intimidating here. He didn't have the gravitas of Damien Darhk nor the subtle danger of Malcolm Merlyn. He came across as a bit campy and not in a fun way. Maybe that's intentional and he'll be edgier in Legends of Tomorrow.