COG has reviewed Dex and is not impressed:

Dex Review – Well Crafted but Poorly Executed

Though not a new game, Dex finally makes its way onto the PS Vita. Put simply, Dex is a side-scrolling beat-em-up with RPG elements set in a gritty cyberpunk environment. Though seemingly a recipe for success, Dex is rough around the edges, much like the world you are thrust into. With the Vita version up in the air at times, we take a look at what Vita owners hoped to be a solid title. As a general fan of cyberpunk titles such as Blade Runner, Deus Ex, and Shadowrun, Dex seemed right up my alley.

[...]

Overall, Dex felt unoriginal and generic, and the long load times really did not help. While the visuals and audio were definite positives for the title, it seems to lack a certain substance that makes it fun and engaging. Like we found in our PS4 review, Dex ends quite abruptly with a relative lack of explanation. Although it does feature more than one ending, don’t expect the other one to be much more telling. Though Dex had the potential to be a cult hit, especially on the oft forgotten Vita, this journey is not particularly memorable enough.

Score: 60/100