I loved OMNI early on, and even as a teen appreciated the fact that its slick big-magazine format "validated" science fiction and science fact in ways that the digests didn't.
But man . . . I have to echo some the observations above. Somewhere along the line I found myself flipping through the pages and thinking "what happened?" The percentage of psuedo-science and trifles hit some crucial point and I just gave up.
In fact: If you search the letters column, you'll find one by me, ranking on the magazine and cancelling my subscription! (To my great embarrassment, the refund check went to my sister, who had bought me a gift subscription . . . that was hard to explain!)
That said, I wish the reboot well, and hope it emulates the spirit of OMNI's early years, not the lazy sensationalism of its decline.