Unity mesh 'Size' and question for gamers.

First off, I don't build my models to work with a 1,1,1 size,its hard for me to judge everything, so I change the 'Size' in the unity editor, is this bad? Would it mess me up later? If so, how would I keep a 1,1,1 size and be able to make it fit with the world?

And lastly, I am designing a RPG for my first game,nothing mayjor, its just me doing it. Say the game didn't have that 'Nxt Generation' feel,like god like graphics, tons of features, etc... etc... would you still play it? Say it hard sucky textures and stuff, yet storyline was good? And do you have any ideas or tips on how to get people to play my game? Since its my first one I'm not selling it (No duh right?) but I don't want it to suck so bad when I do make a good game, people think it would suck because of this one,from a bad past in the line of game design,but I know i'm not ready to make something massive like Battlefield 3, Skyrim, or all of them AAA games.