What constitutes a good army of these factions at 750 points? I have some scouts and Mauhur, Mordor and Moria Orc Warriors, and some Blackshields.

Thanks

You could go for the themed force the raiding part that captured Merry & Pippin in the books. It was a mix of roughly what you have.

You'd only need Ugluk and Grishnakh if you wanted to be exact about it

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Lamh Laidir in Uachtar

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Blackshields, Groblog and a couple shamans, with regular goblins with spears for support is really quite good for Moria. The Warg Marauders are also kind of stupidly powerful.

For Isengard, lots of crossbows and Vrasku are good. Berserkers and feral uruks are great and pike blocks are reasonably good. Shaman in there for fury, is also as above, quite good. Uruk captain with heavy armor and shield is strong and at a little higher points 600, 700 Saruman and Grima are devastating. I think Thrydan wolfsbane is also good.

Mordor is a little more versatile, I think you could make a lot of things work but I think the basics are lots of Mornanon orcs, again with a shaman or two for fury, with a named ringwraith on fellbeast,with probably the Dark Marshal maybe the knight of Umbar being the best few. Gothmog is pretty beefy as is Shagrat, War leader.

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Cheers,

P