Like him as in, as a person? He is evil and lacks personality, so no.
Like him as a character? Also no, cause he is more boring than a commercial break and his retroactive insertion into the story doesn't make a lick of sense.
When it turned out that Emet-Selch was behind the Garlean Empire in FFXIV people were shocked, but quickly realized that this explains a lot of weird shit about the empire. Like why are they so counter productive with their goals. Or why the Emperor okay something that was essentially the complete and utter destruction of an entire continent.
The revelation that the Lich King was created for the purpose of gathering Sigils for the Jailer not only makes Kil'Jaeden the Deceiver look like a total chump but makes all three Lich Kings total loosers as they never even attempted anything that would further that goal.
Also we are supposed to care about his evil plot, but it's way too vague for that. He needs the sigils to get something that will enable him to do something that is specualted to negatively affect Azeroth. Well hot damn I really do understand the stakes here and am shaking in my boots at the prospect of the half dozen characters i still tolerate, being somehow hurt.
Also also, what's the worst that can happen? He's going to kill us and our soul enters the Maw? We already showed that we can escape no problem.