All as an adult. As a child, alien movies were the few types of movies that would give me nightmares. I wasn't sure if I'd ever seen Communion before.
Turns out I would've NEVER forgotten this movie. As I was watching it, with most movies I start with a 7 (by default) and adjust upward or downward based upon if there's something I actively like or dislike about it.
As I was watching this, I started with a '10' due to impact, atmosphere (I loved the NY ooze of Christopher Walken and Lindsay Crouse and the 1989 vibe as 1989 was a magical year for me - I just never realized it back then), message, blending of genres, and potential for being memorable to me (kinda like impact, lol).
And I immediately deducted 1 point each for a) a slightly meandering plot/very occasional dragging and b) I personally thought the short "grays" looked stupid/comic and the floating aliens too "undetailed" compared to some of the other movies.
And thus "thought" I rated the movie an '8'. Quite respectable. After "sleeping on it", I decided to read what others said about "Communion" on IMDb (reviews and message board threads), and was surprised to realize I actually rated it a '9'.
I decided "b)" above was a bogus deduction as who the hell am I to think the aliens looked silly if this was a movie really based upon a reputable guy who did NOT just cook these things up for intriguing movie effect?
When I came back, as I'm reading IMDb because I'm more eager to read other's thoughts, have searched Google for Whitley Strieber, and now will probably read all Whitley Strieber novels based upon true (to him) encounters.
Then I looked at my own voting history and looked at the few other movies I rated a '10'. All were due to impact and overall "plot" issues to me.
And I finally gave this movie a '10' as although it still is NOT perfect, uh, it's impact on me actually was as memorably great as the others.
For comparison, here's the other movies I rated a '10' (no flames please), will probably discuss more about Communion as I truly grooved to it:
Falling Down (1993), Hard Candy (2005), Mr. Brooks (2007), Taking Lives (2004), Tape (2001), The Butterfly Effect (2004), Vanilla Sky (2001), Babel (2006)
(The only movie above that I was truly shocked when I realized I'd rated it in that lofty '10' category was "Taking Lives". As it didn't pass the impact test as I barely remember what that movie was about - how's that for amnesia impact? But changing that to an '8' or '9' for that? Nah, lol)