I've been playing Soul Calibur since II hit the arcades. It's a mild skill-based fighter being arcadish. I do prefer II out of the lot for reasons. haha. If I have to be really picky then Virtua Fighter was where its at.

Killer Instinct is just more what I like in Soul Calibur, I mean who can say no to CCCCCCCombo breaker.
I have Street Fighter, because like Mortal Kombat it's just one of those games I grew up with. Sadly as you say it just didn't pull through the eras. MK11, yeah the grind and the obvious pandering still keeps it out of my library.
Dead or alive, well, I don't see it as a bad fighter. In fact, I prefer it over King of Figthers. Finally, Tekken, it pays for itself. I see it as a good skilled based like Virtua Figther was for me. It is not something you just mash yourself into, and you need to grind away to git gud.
I need to play other ones though as I haven't touched BlazBlue or Dragon Ball Z...