I still think that there are a number of flaws with the rules in Formula E - particularly the rules relating to safety cars...
Since the races are time-limited, safety cars can massively impact on the race, since Safety Car laps are much slower than ordinary laps, they disproportionately take out "race-laps"... Since they race on street-circuits, you would expect many more accidents needing safety cars than other series - but if there's an accident that needs a safety car, it can easily take out a quarter of the race!