The biggest issue with the 01M isn't that it is so awful, just that it isn't in step with the rest of the car in which it is used in terms of durability. Plus, it is expensive to replace. LOTS of automatic transmissions are only good for ~150k. Our shop replaces them constantly in all kinds of things. But if you had a Chevy Traverse that actually made it to 150k and the 3.6L's chains haven't flown off, or the suspension hasn't fallen to pieces, or the brake lines haven't all rusted away, and the trans died, you'd not bat an eye. It's a Traverse... 150k and it is used up anyway.
But an ALH Jetta or Golf at 150k is just a baby. Simple, reliable, super easy to service, lots of fun upgrades can be done, so if ITS transmission died at 150k miles, you'd be pissed. Because the rest of the car was still so good.
I would place the 01M in the area of a '3' in a 1-10 scale of durability, with a lot of Chrysler 41TE, 42LE, and some of the Ford AXOD and 4R70W and GM 4L60E transmissions being worse, with longitudinal Aisin slushboxes easily gaining the top spot of a '10'. Those really are the ONLY automatics (conventional torque converter/wet clutch pack/ planetary type) seemingly able to claim an "indefinite" lifespan under most normal conditions.
That said, at this stage of the game, the newest ALH cars are now a whopping 17 years old. So really the overall condition of the car, regardless of how many pedals it has, should be taken into consideration. I'd not turn down a clean, nice, well cared for ALH+01M if the price was right. You can always fix or even convert the transmission. Not so easy to make the body and interior look good again if it is trashed.