Pocket Gamer: Most endless-runners don't give you a narrative - just a motivation. Temple Run is all about getting away from monkeys, and Canabalt is all about just getting away. Even the games that do dally with a proper story do so with one eye on the fact that no one's going to really care.
In Dream Chaser's Story mode, some of the talking-head cutscenes that occur before your magical sprints are longer than the levels themselves. Thankfully, they're skippable, but it highlights the fact that this is a game that often focuses on the wrong things.