Would it be difficult to measure the EU by the Democracy Index, seeing as the EU has a parliament, elections, laws, a currency, a supreme court and a central bank?
What challenges are there for the measures of democracy of the EU's for Electoral process and pluralism, Functioning of government, Political-participation, Political culture, Civil liberties? https://en.wikipedia.org/wiki/Democracy_Index
The index is composed of 60 questions (page 9), can't the word "nation" be replaced with "Union"/"EU" and the questions answered by experts? If the EU has judiciary and a legislative branch, and all the hallmarks of a nation then the questions can be phrased to apply, i.e.:
- Are elections for the EU legislature and head of the EU fair? 1: No major irregularities in the voting process 0.5: Significant irregularities occur (intimidation, fraud), but do not affect significantly the overall outcome 0: Major irregularities occur and affect the outcome