The lack of tactile controls for things like climate controls, sound system, etc., is very frustrating. I find myself having to mess around with the touchscreen much more than I'd like while driving. You get used to the central screen in lieu of a traditional dashboard pretty quickly, but I'd prefer more traditional dashboard functions to be aligned to display(s) on the driver's side.
I despise the lack of a traditional keyfob or non-phone means of locking/unlocking the car other than the awkward keycard (only useful through the driver's side).
It represents an extremely opinionated way of doing things. If you love life with your iPhone and Apple's extremely opinionated way about how it should work and how you should work with it, the Model 3 gives you something approaching that. Smartphones have their utility, but I'm not the kind of person that lives my digital life through one. I therefore have no love for the idea of my car as a roadgoing smartphone. I also couldn't possibly give less of a shit over Autopilot as we are so far away from that technology being rigorous.
Interior materials, particularly the carpet, are cheap.
There are also significant privacy implications associated with the connectivity, which Tesla does not do enough to address.
Things I do enjoy: the refreshing minimalism, the styling (though body panel alignment still has room to improve), and the energy & drivetrain technology. It is definitely enjoyable to drive. Driving our other combustion engine hybrid is a steep step backward into a cruder era.
Bottom line: Tesla's energy & drivetrain technology are years ahead of other manufacturers; if that matters to you, there is no current package like Tesla's. I look forward to the time when more traditional auto manufacturers catch up and I have well-engineered choices that don't require me to live with Tesla/Elon's opinions on how an EV should work.