This review encompasses Total Drama All Stars and Total Drama Pahkitew Island. Both series were alright but felt like they ran their course and rushed character development.
All Stars: Consists of a mix "original" cast members from Seasons 1-3 and the next generation, Revenge of the Island. This season seemed more tied to its roots of Total Drama Island with character dynamics and overall plot, but the execution was rather dull. Chris McLean ends up sucking the show dry of normalness. Disappointing use of characters like Mike and the original cast who are largely underused.
Pahkitew Island: 14 brand new contestants on a new island with familiar traits from Total Drama Island. Characters were either pretty interesting or just plain annoying. Chris McLean sucks and Chef is basically nonexistent. Challenges at first appear very interesting but somehow are not very useful for the storyline. Things stayed exciting towards the end with a few enjoyable moments, but the remaining cast becomes rather disappointing and limits the potential of the ending.
Unless you're a dedicated camper (Total Drama fan) neither of these seasons are particularly worth watching as they don't really add much to the series.