Overdrive was, to say the least, a modest effort at an adaptation of Boukenger. The Zords are not as impressive as in earlier seasons, and the pyrotechnics lack the variety and logic that made previous seasons (almost) more believable. Plenty of plot twists abound in this storyline. Also unique are the variety of locations and variety of villains. Such diverse variety of either has not been seen in the series since Time Force (locations) and In Space (locations and villains).
The actors voicing the Rangers, as usual, lack the ability to pull off a convincing job of acting in a way that impresses anyone older than the intended audience of boys ages 7-12.
Without giving away too much, there is countless recycling of material in this series; as pieces of equipment, costumes, zord parts, and locations are recycled from everything from MMPR Season 2 to Turbo to In Space to Mystic Force.
It is obvious that the writer for this season was trying very hard to both appeal to nostalgic tastes to win back adult viewers who fondly remember the old show and keep it new and fresh for the children of these early era viewers. It would almost appear he was trying too hard and the show was pulling itself in too many directions. But overall, a modest effort given the intended audience.