Absolutely, the Republic was dead and buried long before Marcus Aurelius came on the scene. I wouldn’t particularly cast him as a villain, and The Meditations is a fair legacy for any historical figure.
Persecution of Christians by the Roman authorities increased under his rule, but on balance I’d prefer not to prod that particular hornets nest, lest I provoke a swarm of angry atheists.
Heh...I considered raising that, but I've never read anything linking him to the persecution of Christians directly, and there are reasons to think he eventually discouraged it.
Kinda gave him a Mulligan due to lack of clear causation...lol. seems likely he didn't do a lot to stop it in his earlier rule, but to be fair, he was dealing with a lot.