You couldn't be more wrong if you tried.
The M96/97 engines do not score up over night, that's just preposterous nonsense Failure rate is roughly 10% if you take the averages, and a carefully warmed up engine given full beans at the appropriate points will likely be fine. IMS failure is more haphazard, however later ones have proven resilient or you could just put the LNE kit in and be done with it. Add a third rad and the LTT, and the engine should be fine for many miles.
DFI units are not scoring any more than any other engine in the world (I can only assume you're referring to Baz's post the other week), including the ones in the Zeds. Gearboxes are strong as anything, and certainly stronger than the many issues we've seen in the 350. Tiptronic and PDK 'boxes have proven themselves tough, too.
I mean, if you're going to criticise them then criticise them on the costs to repair if things go wrong, but at least understand what you're talking about before you label the 9x7 cars as unreliable. I said get an inspection first, and yes, if the bores are showing signs of damage then walk away. As long as that's all good, then you end up with the finest sportscars sensible money can buy.