I wouldnt be assimilated simply on the grounds that they dont ever do anything outside of exist. If you ever see a borg theres like a 100% chance that it will be standing somewhere in a vaguely menacing manner.
You never see the borg play sports, party, rip *****in guitar solos, bang chicks, do some awesome space gymkhana, or even just chill.
Its just this. Show Image
Just sorta standing around.
I like that... That's pretty much what I do... Witness to existence... Isn't that what everyone does?...

Let's look at the list of things you want to do, that the Borg does not do..
Sports:To strengthen the body, instill competition..
--Uses, mating selection, impress *****z
Borg's take: they do not mate, selection is a perfectly logically derived process.
Party:Social engagement
--Uses, the "event" of mating selection
----Undertakings, impress *****z
Borg's take: no impress *****z necessary, all genetic data is known, selection based logically on required specs/ demand of task..
Gymkhana (Drift inspired, demonstrative car sport):
To improve skills and interest in motor sport
-- To possibly push forward technological research in areas of transport
---- Impress *****z with impressive cars
Borg's take: Irrelevant, they have centralized omni-intranet that connects all citizenry. personal travel is not required.. they have no need for cars.
....................Technological research and integration is done through assimilation and rearrangement of existing knowledge..
....................Experimental research must also exist.. but probably not shown in the tv-show.. as the Borg mind is complex enough to emulate a portion of reality and simulate internally the necessary research that they have current use for. Verification, if humans have holodecks that can do this,, I'm sure the Borg can do it..