Well, to be fair, they've always been up against extremely powerful individuals. I'm sure they would do great against 99.9% of people they could fight, but they just happen to get extremely unlucky with the people they choose to fight. Especially the ones that went to kidnap Onee-sama... That went well.
@hitsusatsu11: This is a very strange and decidedly anti-American view of the War in the Pacific, and you seem to be viewing WW2 Japan in a strange light. I would suggest looking up more information on the war in general and then reforming your opinion. While the effects of the bombs were devastating, the alternative was a drawn-out war of attrition on the Japanese mainland, which may well have cost more lives and devastated the Japanese countryside. The effects of the bombs on the civilian population were attrocious - nobody will argue against this. The alternatives, however, may have been far worse. You have to remember that the Americans were facing a war with a country whose people would brought up to believe that their Emperor was a god and whose soldiers were willing to go to any length to protect him. Who knows what they might have in the late days of a war fought on their own land?
You should also keep in mind that Imperial Japan was a brutal, oppresive conqueror with its own history of brual massacres. I'm not what you might call a pro-American guy, but your opinion of the War in the Pacific reeks of misinformation and (in this case) baseless anti-Americanism. Please do yourself a favour and inform yourself on the realities of World War 2 and the atrocities of both sides before you make another post trying to paint Imperial Japan as a victim. You're just making yourself look silly.
I found K-on Witches pretty disappointing overall. The different elements of the show - the actual plot and the moe fanservice - didn't really mesh very well and it ended up feeling pretty disjointed. It honestly feels like they had an idea for a show and someone said "Make it more like K-on." I enjoyed the small amount of actual content there was, and when it wasn't trying to get me moe for one of the characters, it managed to create a great atmosphere. There's a good show in there somewhere, but it got lost underneath all the moe.
Probably Gurren Lagann, seeing as how spiral energy is effectively an infinite energy source with infinite applications that you can access simply by thinking REALLY HARD about it. When you can form a mecha larger than galaxies by willing it... That has to count for something.