Completely agree with you there. I think in the right place it can give a different perspective. One of the above graphics looks like you're looking down onto a monument so to that degree it could be used but I know I wouldn't even get away with 'flat design' with most of my clients as they would say a 5-year-old had done it and it wasn't worth the price tag.

As with most things design it's about getting the appropriateness of technique to task.