Yeah, my SPM on Hardpoint hovers just above 500 and I'm almost always the top in a lobby, according to the leader boards. That's basically all I play so I couldn't say for sure about the others you listed but I'd say anything above 450 is solid for Hardpoint.
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I have a 432 SPM in Domination, 429 SPM in Kill Confirmed. I haven't played much Domination, but I rarely run into someone with a higher SPM than me in Kill Confirmed. Elite says those two SPM are ranked 102613 and 285252 in their respective game modes.
SPM doesn't mean as much as it once did. Running uav, counter uav, vsat will boost your spm quite a bit, especially in a full team. I'd say a good spm is 400s. Those who listed 500s I'd say would be a great spm, not just good. But it depends on how you play, what game mode, if you're just spawn killing in a party running high killstreaks, etc. Once again, it doesn't mean much in terms of how good a player is compared to games in the past.