guys, the world is not divided into good people and death eaters ... similarly not between fun people and boring people.
hermione is not fun , not extremely boring. she is the most useful companion harry got, and without her no one would have been able to pass a devil's snare, a gate of fire, locate the chamber of secrets .. but as time goes by harry's dependancy on hermione's knowledge is decreasing chapter by chapter . i suppose that's JKR's path to prepare harry to the lonely path towards voldemort. but the thing is ... hermione is an essential and necessary companions , her advices on emotion and other peoples are useful .
hermione is basically a girl , the most of the fun things hermione does are the outbrust of her girlyness ... like xMarauderx mentioned , the little hearts on lockheat's timetables, the going to a party to make ron jealous are all the glimps of her feminine nature , which she keeps hiding in her bossy and educational nature. many things hermione does are fun to watch, but for hermione, they are results of anything, but humor.