Well the price goes down for the Dothan even more if you buy a Celeron M at 100 bucks. The performance is similar to the Pentium Ms although the Pentium Ms do beat it by a bit. If you want real value gaming, then go with the Celeron M+adaptor which is combined around 130-150 bucks. The AMD venice OEM is around 120 dollars. The Dothan performs well in games, but as an all around Computer chip, and AMD still has a big advantage.
Also, to answer why people don't use Turions and overclock, the reason is that it doesn't support a 128Bit memory interface.
There are 3 reasons why AMD turion platform notebooks lose to Intel Centrino mobile platforms in battery life.
1) The AMD turion uses more power.
2) The AMD Turion uses DDR which uses around 2.6 volts. DDR2 uses 1.8 volts.
3) The AMD turion is USUALLy paired with Radeon X300 Integrated graphics. This uses more power than the crap Intel integrated Graphics.
If it were just one of these, then battery life would be close. But if you add up all three, battery life will be significantly lower than Intel Centrino platform notebooks. With AMD switching their turion processors to DDR2 next year, and Graphics chips getting more power efficient, AMD should close the battery life gap significantly. But yet again, who knows, Intel's 65 Nm process might just give it a little more edge in the battery life department.