“i think we begin a very slippery slope when we start judging how “orthodox” someone is and if we were to put ourselves to such a test who knows how we will fare”
Negative. Negative.
Don’t even think of trying that center left croc.
There is clear definition of who is Orthodox.
Personal observance is secondary. (Moses Mendelson was Orthodox? Shaul Lieberman? Avraham Burg?)
Feiglin, Katzele, and Ben-Dahan are Orthodox. Irrespective of disagreement of the application of certain mitzvos. The rest are either half or beyond the spectrum.