The Volca Drum is a lot of power in a little box, ridiculous sound-shaping capabilities so that it can certainly be used as a groovebox rather than simply a drum machine.
But getting the sounds you want takes time and patience, with one parameter knob doing a lot of the work.
If you've got time to spend, maybe on a long trip or while waiting for something, it's a great way to entertain yourself. And if you're new to synths, it's a good educational tool, learning how things work to create specific sounds.
But I take a star away for the fact that it's not usually 'instant fun' for me, it takes a little while before the 'chore' element passes. Maybe I'm too impatient!