i think this port of minecraft gets a lot more hate than it deserves. it is essentially a port of the old legacy pocket edition and bedrock edition smooshed together on steroids and considering the limitations of the 3DS it's actually quite impressive.
the camera controls with the c-stick take a bit of time and effort to get used to but once you are used to them they are very responsive - at the start of my playthrough i was constantly conscious of my fingers on the controls but after a while it faded into the background (the same way you'd learn to use a more typical analogue stick or a mouse)
there is the occasional lag spike when you are breaking blocks (especially sand and gravel), but the average framerate seemed completely fine and i never had any issues dealing with threats in the game due to lag. also, the game freezes for about 15 seconds every 20 minutes toauto-save, but you can also just manually save when you're ready to which resets the timer. (saving the game does not necessitate quitting to menu, like most other versions of minecraft)
i went into this game expecting a small unfinished sandbox like the legacy pocket edition but i came out having played a surprisingly robust port of minecraft. if i were travelling or on the go and wanted to play minecraft i'd definitely choose this over playing pocket edition on my phone!