I've already posted upthread that both Moldvay Basic and Gygax's DMG have many worked examples. The examples in Moldvay enabled me to learn how to play and run the game. Gygax's DMG is not as good as a teaching tool, for various reasons - the main but not sole one being its lack of clear organisation - but it's not wanting for examples.Has any DMG had enough examples to suit you (other than 4e, which I assume is a yes for you)? If not, why do you think D&D hasn't gone to this supposed "industry standard" after nearly 50 years?
I think in this thread I noted one way in which the 4e DMG lacked explanation connected to clear examples - namely, of how to factor condition-infliction into the p 42 framework - and this was something that the book was criticised for back in its day. I've also been a prominent critic of the lack of good explanation accompanying some of the skill challenge examples in the 4e DMG and Rules Compendium, which illustrate without explanation how narration of failure can be decoupled from causal/process reasoning about the player's declared action (ie they are examples but not worked examples).
As I think I've also mentioned, the lack of examples in Classic Traveller for play (as opposed to PC gen, which has a terrific example) was one of the reasons why I wasn't able to work out how to play it until after I'd read and played Moldvay Basic, even though I owned and read Traveller first.