>>23328387Yeah, that's not a bad way to go about it. I think I went with Mazinkaiser, SKL, Shin, Zero, Infinity, and then Toei, then reread Zero and rewatched Infinity. From what I recall of the Go Nagai manga, Mazinger and Great are rather bare-bones, although it's short and inoffensive enough of a read. I'd say if you hate Kaiser, Shin, and your experience with any older Toei cartoon (even Getter Robo would be a good example, I wish I could give you my appraisal of it but I haven't seen it outside of the 7 or so episodes almost two decades ago, although I'm sure it can't differ that much in quality next to Z and Great.), then you will not like Toei Mazinger. But it's very difficult to imagine that anyone would hate all of these, I mean moreso that they give you some representations of Toeizinger, either the plotpoints or the feeling of it.
This
>>23328485 is generally good advice, you can just rewatch or reread things to catch the influences that older (and most likely longer) anime have had on them. The only other mention is that WITHIN a franchise or universe, it's almost always best to just go by production order. I can't really think of any exceptions other than possibly watching one or two Votoms OVAs taking place between some episodes, watching 08th MS Team after the other OVAs, and I'm going to hard-disagree on Do You Remember Love preceding a watch of the original Macross. But for big franchises with disconnected entries like Mazinger and Getter, it's probably unfair for them to be expecting you to have watched the 50-year old material, although you'd certainly be rewarded.
I really cannot wait for you to get to Shin Mazinger Zero however.