Stratford was recently named as the countries worst crime hotspot[0].
According to the FT, "the bounce" has failed to materialise [1].
I would not recommend a walk around the outskirts of the Olympic stadium for all but the very brave, it's still an area in much poverty with many social issues completely unresolved, notably violent crime (3.5 for every 1,000 people) [2].
[0] - http://www.standard.co.uk/news/crime/westfield-stratfords-po...
[1] - http://www.ft.com/cms/s/2/543cabaa-8a41-11e2-9da4-00144feabd...
[2] - http://crimeinlondon.com/newham/stratford-and-new-town/viole...