Do you mean the e-p1?
Be wary of reviews on AF. They speeded up AF with a firmware release and the e-p1 runs the same algorythms as the e-p2 now so e-p2 reviews are more relevent.
AF is no good for fast moving things like dogs/kids etc but is fine for static things. Actually it feels pretty fast for static subjects even if you’re used to a dslr.
The 14-42mm kit lens is pretty good, especially outside. Inside and/or in poor light it will struggle to focus. It is very small.
The 16mm is smaller and better. It will focus in near darkness – dim pubs, light of a campfire etc.
ISO performance is pretty good. With the 16mm lens you can get quite acceptable images from the light of a campfire.
I had the e-p1 and upgraded to the e-p2.The biggest difference is the e-p2 can accept an external viewfinder. If you don’t need one then the e-p1 offers great value.
The big difference between the e-p1/e-p2 and e-p3 is the e-p3 will focus faster. But, this only applies to static subjects. It’s still no good at tracking moving targets so the benefit isn’t quite as important as it seems.