Bugs fixed?
I use it regularly but my biggest LO gripe was trying to do a basic mail merge with an image on the master page (company logo or whatever). About five years ago a bug appeared which broke formatting if there were more that about 20 images in a document - LO generates a mail merge output document so 30 recipients with a single logo on each page would do the job for instance. This was on the bug list and was fixed then immediately broken in the next update ... last time I looked it was still an outstanding bug.