I'm with el es dee on this one. DXM can really be awesome, especially if:
1) You smoke pot with it
2) You know what you're looking for
Unfortunately it took me a few lame, sick, and or scary trips to find the real beauty of Dex. I don't think it gives the same sort of mind fuck as with lsd, but I always feel like I'm in another sort of world. I don't feel confused like I do on acid; things make sense, but in a different way. I also get very strange mental sensations. . . I wish I had better words to describe it. I go through a cycle of feelings. Like, I'll feel the sort of satisfaction that you feel when you finally figure out a really tough puzzle or homework problem, yet I haven't solved anything. And I get the total feeling of deja vu for no good reason. And I get the sensation of being surprised even when nothing is going on. I also get contrasting feelings at the same time (I wish I could explain it, but you gotta experience it to know what I'm talking about). I always recognize this contrasting effect as the trademark of Dex, and then I get sent into total deja-vu.
And it can be very euphoric as well, but this generally just comes when I've either used pot or nitrous. I'll agree that it is better than LSD, but I feel like it's rather harsh on the body, so I avoid doing it more than once per month.