I picked up a 3rd ISD and lemme tell ya - running three ISD's with Motti is quite strong indeed. You can even give them some upgrades if they aren't all ISD2's.
Agreed. One of my friends ran two tricked out VSDs and an ISD (no fighters) with Motti against a 2 VSD, 1 Gozanti fleet + Rhymerball fleet. He just ran Engineering commands every turn to keep his ships up through the bombers and drove straight at the capital ships, winning that way. Even four bombers + BCC have a tough time chewing through all those shields and hull.