"Ender's Game" and "Ender's shadow" were the best of the series IMHO. I'll have to read the prequels. I just hope they don't kill the movies like what happened to starship troopers.
*edit. Some other military sci-fi authors i enjoyed are John Steakley "Armor", David Drake the "Hammer's Slammers" series , William Dietz "Bodyguard" and "Where the Ships Die", and David Weber the "Honor Harrington" series (the first several books at least, it gets a little long in the tooth.)
those aren't all the books i read but the ones i remember really enjoying.
