How to Evaluate a Design Template Before Using It

I was recently reviewing various free and premium design templates, and noticed—many templates look good but are difficult to use.
So I want to know from the community—

What features are most important for a High-Quality Template?

Examples:

Proper layer grouping

Clear layer naming

Consistent spacing & grid

Editable components

Readable typography

Organized file structure

Multiple export formats

Realistic mockup previews

I came across some references during my research. One of them is as follows: GraphyPix

The template structure and layout approach are well-illustrated here, which is worth learning for new designers.

:speech_balloon: Community Input Wanted

When you use a template, what criteria do you check first?

What common mistakes are most noticeable?

And what do you think a professional template should look like?

Your insights would be very helpful.
This way, we can all understand good template standards and help new designers.