Everything is relative. You can increase the sensitivity of the mic in but you may get a slight noise increase. The blog discusses the effects of analogue gain compared with digital gain. (complex but I suspect that we are reading the views of the "cream" of audio anoraks). The proof is in the testing, your Rode may perform better depending on the amp it uses.
Zoom seem keen to support their products so a firmware update may be forthcoming. Remember the H2 is a new kid on the block being only four or five months old.
Play with various combinations, including the on board mics.
I play mine back through a Bose wave radio and my Yamaha EL-900 organ sound system. Very satisfying.