Yes, it's good enough and very good for a no-sparge method if that's what you actually did. Don't worry about efficiency. It's not that big of a deal. If you hit your desired OG you're good to go. I only get about 72% on my mid-range gravity beers, but it's an honest 72%.
The reason I do not sparge is because it would require more equipment, and take longer time (both could be argued as being good things, I know ).
I add all the water from the beginning (EndVolume+BoilOff+DeadSpace+GrainAbsorb=25L), and circulate it through a large sieve during the mash, and end up with 19L. Very easy, and fairly efficient.
You have some very HIGH quality wort there. First wort, is the best wort... the longer you sparge, the more undesireable stuff comes from the grain.
Efficiency is nothing more than a number. If you want to use LESS grain to reach the same OG, then worry about eff. If you dont care, do what you like, but remember, no sparge will give you GREAT wort! Low PH, high sugar content and no nasty tannins.
61% percent efficiency without sparge ?
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