No, it really wasn't. The TV series was a sequel to the OVA.
I was pretty indifferent to ROD the TV the first time I watched it, when it was on TechTV (and I had already watched and loved the OVA at this point). I watched it a second time though (since TechTV never finished it) in subs rather than dub and did enjoy it quite a lot. I now own the boxset.