Your so called "Reapers" were beaten by one man, and in one case, a giant worm. Your logic is flawed.
-Twi
First, Commander Shepard is the most badass man in the galaxy, and had an entire fleet supporting him. Second, that is not a worm but a thresher maw, and the biggest one ever by far. A normal thresher maw is tough enough. Those things evolved in one of the most inhospitable environments in the galaxy. Third, those were both smaller half-kilometer long ones and were both alone. If there had been one more or if they had been full-sized 2-kilometer ones, shepard would have been pwned, and that giant thresher maw would have been pwned. Fourth, being landed on a planet is harder for Reapers than being in space, where their true prowess is unleashed. One fleet=One Reaper.
@tesb: You will pay for your treason dearly. If this is how it is going to be, then I'm going to pull a Shepard and get support from the fleets of the Mass Effect galaxy, including the Reapers, buy Rebellion so I can get titan(s) for my Sins fleet(s), and go find Andrew Ryan down in the underwater city of Rapture to get the support of the big daddies.
@Everyone: FEAR MY ARMY, FOR IT IS EVER GROWING, AND IT IS EVER POWERFUL. YOUR 'WINJAS' CANNOT STOP ME, NOR CAN YOUR TRAITOROUS POSSUMS OR YOUR LITTLE PONIES. THIS IS THE ONLY CHANCE YOU WILL HAVE TO JOIN ME BEFORE IT IS TOO LATE. IF YOU DO NOT JOIN MY MIGHTY FORCE, YOU WILL BE DESTROYED.
-Sir Red Rocky54