In my experience xkcd usually goes for funny- while occasionally going for "awesome" or "heartbreaking". This comic isn't any of those things either.
Is there some feature you laud in web comics that this xkcd possesses?
I laud web comics that are entertaining in some way, which usually entails some emotional connection to the content. Don't you wish you lived in that universe? If a web comic hits some note that resonates with the reader in whatever way, I think it's done a good job.
Here.