I reference this comic regularly and nobody knows what I mean, and now all of you can know what I mean:
It's so hit and miss. Sometimes there's an article or story that still blows me away. Flip flip flip past the junk. Most of the OMNI articles are rubbish, UFOs, James Lovelock's Gaia nonsense, psionics, cryptozoology, etc. I mean, I love that they serialized Stephen King's Firestarter, but it is a nonsense story about magic mental powers. And the other story in in this issue is a man finds a sarcophagus of the fictional character "Jesus", but melted because a magic sky fairy used energy beams to take him away or some such. Fuck that nonsense.
The archive.org scan is shit, so the pictorials (the Dune pictorial was hugely influential on me, long before I read the books) are hard to view, but I can search for them by title if I want a hi-res copy. The Internet's often bullshit, too, but you can always search for the good stuff, and there'd be more if people weren't such jackasses about old content.