That's not an inherently terrible thing. Bulldozer did many things wrong that led to that awful performance, it wasn't just the CMT. AMD sacrificed a lot to get the frequencies up, and every other number in the system suffered for it. Worse, the schedulers available at the time weren't smart enough to properly keep the things turboing, so that sacrifice ended up being for naught. ARM is competent enough to avoid the obvious pitfalls there and it's a decent strategy for the what the A5xx series is supposed to be (power efficient/cost-optimized).