Indeed it was, Jaster Mareel! Being such a big Boba fan growing up, I knew his whole backstory. So when EPISODE II was released, I a little confused initially. I avoided reading about any possile spoilers prior to the prequels coming out (meaning I didn't read Star Wars Insider for yeaaaars), though somewhere along the line I heard that Boba Fett would be in the film in one way or another. I still feel that it was shoe-horned-in fan service at it's finest, much like the green-screened Boba Fett walking past the camera in the Jabba scene that was re-inserted into STAR WARS, in '97.
I don't know much about the EU stuff that was done once the prequels were out, but back in the day, the Mandalorian Warriors had this whole back story, and were originally an entire army that were featured in the Clone Wars. As exciting as it was seeing it for the first time, this made my first viewing of EPISODE II a little hard to swallow, at least story-wise. (The "clones" are now a bunch of guys that are precursors to Stormtroopers, who were cloned after ONE guy featuring Mandalorian armor? Okay, sure, why not.)