I think reprints are fine for what they are, though as stated I think it would be good if they had a definite "reprint" stated on them.
They obviously completely lack the historical significance of the original cards but if you accept that and are happy to collect them for what they are then they don't bother me.
I think the only reprint I have that could be mistaken for the real thing is one of Michael Jordan's Star XRC. To the casual glance it looks like the original and notes nowhere that it isn't and has all the original copyright dates etc.
I do like some of the NBA sets over the years that have revived old designs either using current players or the guys who originally appeared on them but with current copyright info etc.