Digging around a bit more, it would LIKELY appear that a Mali T658 core consists of a single TMU and ROP, coupled with a pair of unified shaders, each of which is a 4x32-bit vector unit, in a similar vein to nVidia's Stream Processors. The block diagram shown here apparently demonstrates the entire 8-core GPU... So the unit has a total of 16 "SPs," granting it 35.2 gigaFLOPS of single-precision performance at the reference 275 MHz clock speed they reference so much.
This is definitely a step up, but naturally still doesn't reach the level of even the now-antiquidated consoles, with the PS3 and 360 featuring 48-SP GPUs clocked at 500-550 MHz, for 192-211.2 gigaFLOPS per, let alone modern PC GPUs which are an order of magnitude above that.
It does still put it within striking range of things like the 3DS and PSVita, which use similarly mobile-style GPUs. The main difference there will be the RAM used; while smartphones (as well as tablets) rely on slower mobile RAM to maximize battery life, (with mobile CPUs and GPUs, memory useage becomes one of the top battery-drainers) mobile consoles don't skimp on RAM, sacrificing battery life in order to have faster memory.