The straight-to-DVD sequel which is exactly what you would expect: nothing more than a meaningless, paint-by-the-numbers cash grab. To be honest, most of Disney's spin-off work is exactly this, so I'm not surprised, but the sheer level of pointlessness to this movie left a slightly bitter taste. I can deal with sub-par plots, pointless cameos and even the lack of the original voice actors (though one of the few things Mulan 2 did right was ensure that Ming Na-Wen returned for the titular role) but there's much worse on offer here.
For starters, we get the strong vibe from the first film that Mushu is not particularly liked by the Ancestors, but the reason given is that he failed as a previous Guardian in his role. His actions throughout Mulan prove to be his reparation and by the end of the film he is back on his ancient pedestal, where it seems to be the case that he would remain inert until next called upon. Certainly, based on his general state when summoned for the first time in Mulan it would appear that he had been a statue for many years. On top of this, whilst a little cowardly, Mushu remains clearly honourable and never shows any hint of malice, particularly towards Mulan and her family. He is a likeable character with some emotional depth, which is part of his charm; he's a lovable underdog. All of this, however, is retconned for the sequel. Here, the Ancestors have a clear hatred for Mushu, probably because, as a Guardian, he is a complete dick. He's self-serving, arrogant to an extreme, incredibly demanding and completely lacking in empathy. His scheming directly enables much of the storyline and therefore casts him as the antagonist, albeit one who does an about-face the moment the plot no longer calls for him to have these character traits. It makes him into a distinctly unlikeable character, makes the Ancestors seem petty and unkind, and generally makes the spirit world seem quite manipulative. That's problematic from a continuity point of view but it's also pretty culturally insensitive.
Mushu's character assassination isn't the only big step backwards for Mulan 2 though, which seems to go out of its way to also trample on a large amount of the message from the first film. Whilst the core message of the sequel is that "love conquers all" (and also that arranged marriages are bad), it goes about it in a very ham-fisted way and leaves you feeling that Mulan herself is less the impassioned, head-strong female idol and more a victim of Hollywood's notions of "romance". Her relationship with Shang is pretty troublesome and it almost validates Mushu's reaction that perhaps they shouldn't be getting married (if his reasoning wasn't so damned evil). They barely agree on anything, they don't seem to enjoy each other's company and, frankly, Shang comes across as a complete misogynist. Given how much the first film focused on female empowerment, seeing the sequel instead focus on why men should be manly and women should accept and value that felt backwards.
Overall, then, the film is a shambles. When it isn't actively erasing the messages and characters of the original classic, it's scraping by on a poorly written plot full of deus ex machina and pointless side-quests, badly attempted homages at fan favourite moments from the first film or odd attempts at humour (there's a lot about how women find shoes enrapturing). Overall, it's not even worth it for kids to watch as it will only serve to annoy or undercut the original. Just rewatch Mulan instead.