Actually, I prefer it to be smaller since it's leaving you a better direct visual space, while after a few game in the pbe, seems to be as easy to glance at. Also, having a smaller map reduce the chance of misslicking on it while being chase and dying. But yeah, as much as you cand disagree I prefer it smaller. as long as I can pin point the general location of everything at a glance it's fine.
I'd say you should be able too completely customize your HUD, minimap size, location, score, skills location and all. Allowing to personallizing the hud would allow much better game play I think. If I have a bad habit of looking on the bottom left corner of my screen and I put my minimap there this just became a great habit!