The graphics in blockland are fine, what are you talking about.
Also, Runescape sucks.
The main reason RPGs are done in Blockland is that it is fairly open-ended and the sandbox genre is good for recreating all the other genres. With the building you can even build the rpg yourself or incorporate town building systems and such.
Also, why would a v9.1 patch be quicker than skippig to v10?
v10 would be quicker because it has 3 characters, whereas v9.1 has 4. Other than that, there's no difference, its just what you call it.