The 1AD/2AD series were pretty good (I had 2). Yes, initially there were the head gasket issues which affected a small % of them (but of course Toyota also fixed them for free even past original warranty) but after that problems usually related to use that wasn't suitable for a diesel (short trips where the engine never reached full operating temp. etc.) & DPNR/DPF - same issues as any other modern, emission-equipped diesel might.
Toyota dropped them & brought in the BMW N47-derived engines because it was not worth the cost of developing an EURO VI compliant solution for the relatively small nos. that they were selling (I have a suspicion that this was at least partly because Toyota don't appear to have gamed the tests the way that VW, Mercedes etc. seem to have, so ended up in higher tax brackets or higher official consumption).
The Toyota dealer service staff I have spoken to have said that the N47, as far as they were concerned from a workshop pov, were a sideways move rather than an improvement.
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