To the OP...as you can see from the replies "One mans meat is another mans poison" old but true saying.
The truth of the matter is, what might be a good engine one might not be for another despite the fact that one might be better than the other. Opinions will ALWAYS vary, its a human thing.
The facts are:
The 200TDI is a simple engine, easy to diagnose, easier to repair cheaper to repair, parts are still available and many purists love them still.
Compared to the TD5, its lower on power, more noisy, "can" leak oil which I think would be the main negative comments compared to a TD5
The TD5 is a more modern engine with more power, quieter and again the TD5 purists love them.
So to reply to your specific question, the above are the main facts. You have to look at the facts between the characteristics of the engines and YOU decide if the 200TDI is a good engine because it will be down to YOUR opinion.
A simple engine low on power might appeal to some and others might hate that and then there are people who love the power, quietness of a more advanced and sophisticated engine like the TD5.
What I can tell you, is that irrespective of brand, quality of any make is not the same as it used to be.
I still have fully function power windows and power locks working as it was new on my 1897 BMW325is with 378,000 Km, but I have already changed the power window regulators, power lock actuators, outside door handles TWICE on my 2005 BMW X5 with 120,000KM.
On my 2002 325i, I changed coil packs on all 6 cylinders and power actuators within the first 50Km under warranty.
They do not make em as they used to, cutting costs by using cheaper material and less labor has been quite evident without a doubt.
I hope this clears up all the back and forth and exchanges.