More than mediocre? The less expensive devices from Lenovo in particular often got a very mediocre rating in the recent past; the author was obviously disappointed by the B50-80. So does the "bigger sibling" B70-80 perform better? The situation seems to be better with a powerful i5 CPU and dedicated Nvidia GPU.
http://www.notebookcheck.net/Lenovo-B70-80-80MR0006GE-Notebook-Review.152301.0.html