What can't the Olympus OM-D Em5 do as well as a DSLR/SLT camera?

The Oly OMD EM5 is perhaps the first u4/3 camera than can go head to head with APS-C DSLRs in terms of image quality...at least 2009 image quality.  It's often directly compared to the Nikon D90 in that regard.  Basically, the sensor technology finally caught up, and Oly is using the EXMOR technology that made the D7000/D5100/NEX5 so impressive.  However, it still ain't there in terms of tracking AF (no PDAF), but for single relatively static subjects it does great...this encompasses much of what most folks want in a camera.

However, the overall u4/3 system price is still very high; the EM5 competes closely with top-level enthusiast DSLRs like the D7000 directly in terms of configurability and direct manual settings, as well as single shot AF and image stabilization, but entry level DSLRs can beat it in the grab shot and in bang for buck.  When you can get a D3200, T3i, or similar camera for $600-$900 in a kit, the cost of the EM5 is sobering.