One thing that LR does well is leverage Adobe Camera Raw and its great support for many raw formats.
I like how Lightroom simplifies a lot of the editing process. Alternatives like Rawtherpee are very intimidating.
I also like the cloud backup and sync that Lightroom has. But I swear it gets slower and slower with every update.
And adding newly released lens correction profiles. It's nice to have a lot of things just work.