It's got most of the familiar store names which you'll find in every other shopping centre (and, indeed, on most High Streets), with a reasonably good food court and plenty of other places to eat (but no pub!). I can't see much difference between Lakeside and it's nearest rival, Bluewater; some people prefer Lakeside (which is older) whereas others prefer Bluewater. To me, neither of them are as good as Sheffield's Meadowhall. (Also, if I was shopping for bargains in that part of Essex on a Saturday, I'd much rather visit Romford's excellent market).
http://www.lakeside.uk.com/
Chris