Discard condescending naysaying. Identify risks and help avoid pitfalls, but also identify opportunities. Temper an overly legalistic approach. The best solution might not be the most conservative legal position so you need to demonstrate how to achieve a desired business objective, even if that will involve a different legal route to reach it safely. Legal issues are, at best, secondary - identify how best to utilise legal expertise to achieve a client's commercial objectives.
Lawyers often seek to minimise or avoid risk, to leave no stone unturned.
But business is all about risk. If your assessment is right, the same end result may be achieved, but faster, cheaper and more effectively. Legal problems are primarily not legal but business problems. Lawyers often consider the objective of litigation is to secure judgment in the client's favour - a legal win. But the client's objective is always to secure a commercial win.