My gripe with hybrids are they are mechanically complex. More than a standard gas engine or a full electric powertrain. Worst of both worlds.
Toyota and Ford hybrids have been successfully used by cab companies for quite some time now. The old Honda IMA setup was troublesome, but their new setup is great.
It's not like standard gas power trains are simple anymore either--turbocharging, direct injection, and dual clutch transmissions are common, even in affordable cars.