You'll have to trust me: it's a much better game than its handheld counterpart.
At first blush, it's easy to see a bit of Ratchet & Clank in the latest Phineas and Ferb adventure, which is based around the most recent movie Across the 2nd Dimension. This is due in part to the past experience of developer High Impact Games, which is comprised of ex-Insomniac Games and ex-Naughty Dog members. Despite offering a taste of the beloved Sony series, the game stops short of completely aping it to provide a more family-friendly experience that captures the own charm of the Phineas and Ferb series. While it's not going to reach the Ratchet and Clank crowd, it's still a great game for the target demographic of the show.