I have been away from this game for a while.. but recently got back into playing against AI.
I tried a strategy for Saruman that includes taking Tharbad, and found one that worked well. It does require a LOT of help from other factions, and is likely not a good PvP.. but here it goes.
So on round 1,
Dol Guldur... one orc marauder blitz north and south undeep... draws some Lorien/Rohan attention which Rhun will clean up later.
Saruman... I take all the lands to the west of Isengard except Tharbad...
Orcs.. I attack Tharbad with 4 Warg and the Balrog for 1 or 2 rounds (depending on hits recieved).. this takes out all units and damages wall. I also advance 1 orc marauder to Cerin Amroth, Naith, Nimrodel, Limlight, North Fangorn... all other troops in Moria go to Methedras
Angmar... focus most forces towards Anor's Capital, and defending Mount Gundabad
Rhun... pretty much ALL calvary units and the 5 Archers clean up the neutrals to the west of Dorwinion.. and continue on into Rohan territory...
Round 2 forward
Dol Guldur purchase Uruk_swordsman and Snaga.. and work north to take out Northmen, Woodland realm and/or Dale
Saruman.. take Tharbad.. and every round you have it you MUST place 5 Urak Swordsman there.. and 3 in Ost in Edhill (orcs will need to 'block' the path for a Freefolk counter-attack at least 1 round)
Mordor focus Gondor.. (they or Harad can take by round 6) then continue west to clean up.. and North to take out Dale/Dwarf
Harad.. focus Gondor... take southern portions of Gondor and head west to clean up
Orcs.. focus force to taking Wellinghall and surrounding forest.. this weakens Rohan/Gondor/Lorien significantly, and Lorien isn't much of an offensive threat to Moria... defend Goblintown... and after Wellinghall area secure Saruman should be able to clean up the region, so focus to take out Caras Galadhon/Rivendell
Angmar.. take out either Annuminas or Thorin Halls or High Elves lands (whatever is easiest based on what AI defends).. this weakens Amor and gets Amor/freefolk defending on 2 fronts which helps Saruman and lessens pressure on Carn Dum
Rhun.. I purchase nothing but Axeman and archer or two here and there all game, and focus going north to pressure Dwarf/Dale from the South/East.. the calvary group carefully advances to Rohan territory to take out Gondor/Rohan troops and territory Wold to Edoras region.
Later rounds..
Once Tharbad is secure.. don't worry about Bree with Saruman.. go right towards the lands of shire and if all went well near Isengard you should be able to capture Edoras from Rohan about sametime Mordor/Harad take Minas Tirith .. (support from Rhun in attacking Edoras to weaken it) the bonus PU you get for those shire territories and Edoras are a huge boost.. and you may actually be the faction to take Bree and Annuminas as well
It's a cool strategy.. probabaly not for PvP, but makes Saruman, who is typically in survival mode all game, one of the most successful land/capital owners from the Evil faction.