I'm fairly certain every one here is a Josi fan. It's hard to not like the guy. He brings something that neither Weber nor Suter ever had, and likely ever will: actual good hands and puck-moving ability. He's already miles ahead of both of them at both of those things. It's especially impressive given the fact that he's only 23.
That said, he absolutely is not Weber's level defensively, and that is far from an insult. A defenseman with Weber's defensive ability + shot and Josi's puck moving ability + hands, would likely be hands down the best defenseman in the league.
The great thing is that as said, he's only 23, still certainly room to grow. Like you said having two, possibly three defensemen of that level is a blessing, and a rare one at that.