But I had some success with low poly 3D models which I found are pretty easy to make.

Same. I find that for non-artists 3D is easier than 2D because:

1. You get things like depth and shadowing for free.
2. Animations are easier. Or, at least, it's easier to keep them consistent and to control their pace.
3. 3D software has much more tools that non-artists can somewhat grasp.

Of course, my 3D models still look like crap - but it's better looking crap than my 2D sprites...