Doesn't make a great deal of sense to compare Tramadol to Oxy's and the like.
First time I tried Tramadol I was relatively conservative because I had heard that high doses can induce seizures. So I started out with 300mg, took a fair while to kick in but when it did I quite enjoyed it. Slight opiate feeling, but much more energized, which was perfect for me at the time, I was able to cruise around town running errands whilst feeling nice and buzzy.
I much prefer Tramadol to Codeine, for me Codeine is rubbish, that's not to say it has no recreational value, I just personally don't like it. The last time I had Codeine I wanted to give it a decent go (having had very little luck with it in the past) so I dosed 550mg and felt vitually nothing at all, much less than I felt off 300mg of Tramadol.
I think Tramadol is very enjoyable, just depends what kind of high you are chasing. In terms of harm reduction I would always recommend caution which high doses of Tramadol, due to the increased risk of seizures.
However in terms of people chasing a much more opiate-like high, obviously Oxy's would be the way to go