had the same problem with my Canon 600D, my photos were looking washed out, and much darker. I ended up shooting most of my photos with ev slightly below 0 as they looked fine on my camera screen.
Now what i did to solve this is, i lowered the display brightness, so i get a better idea of how dark the actual photo is. Another thing you should do is ALWAYS shoot in raw if you intend on taking some good photographs. You can then open up the raw photos (*.cr2 files) with Photoshop or Lightroom and adjust whatever you want then