My favourite tactic was to capture all the civilians and enemy Agents and use them as your own. With the civilians, they were brilliant at being fodder to grab the enemy attention, then use the mind warp gun to capture the enemy agents. Other tactics include rocket blasting police cars and minigun as they run around the corner.
I hope the Redlime game retains the isometric view and squad control instead of being another fps. The other potential I may see happening is that the new version could be another GTA clone, which might not be a bad thing if they introduce a new twist in the already crowded free-roaming fps genre.