I don't think Lambert plays negative football through choice at all. Some of the highest quality goals I've seen Villa score have been under him. Martin O'Neill, Gerard Houllier and McLeish don't even come close to the counter attacking, movement of the ball and pure ambition of some of the goals we've managed despite being in poor league positions on tight budgets!
To name a few Weimann's at Liverpool last season to go 2-0 up, the build up play with Benteke is world class. Lowton's against Stoke last season. Benteke's against Norwich this season. Stuff out of the Champions League from players who were unheard of at the beginning of last season.