When I bought my 2014 102 it had around 36k on it. It needed a new dual mass flywheel. Other than that it’s been reliable and I’m not sure if some of the DMF wear was down to the previous driver (on the test drive he wasn’t the smoothest!) or if it’s just a VW thing. TBF it may affect other models too?
Pulling off and keeping up with traffic isn’t an issue - it’s geared for carrying loads so first gear is low and gets it moving well. I think you are limited to 5 speed gearboxes with the 102 and that can add to the noise on long motorway trips but you can soundproof them. That would be my biggest gripe - the noise, but then my conversion has a few rattles and it all adds up.
I always think because the 102 is always working more than a 204 it has less issues. Diesels like to be worked hard to an extent.
Certainly wouldn’t think it’s less reliable for being a 102. Doesn’t get anywhere near as many posts on here for being problematic as the 204.