Still, all certification shows is the ability to memorize. I've had people who can memorize the crap out of something but are poor problem solvers.
When I interview, it's a whole process. I don't softball it. I use Topgrading techniques to get to the soft skills, and I create relevant scenarios that the person must build/solve during the interview. Coupled with an aggressive culling process, you can quickly build a strong team that way.
Certification is debatably useful, much like a rear spoiler on a Ford Focus, but definitely not what I consider fundamental and necessary. I won't offload my testing to some company (Sencha or otherwise) with a vested (conflicting?) interest in selling certifications.