yeh i would watch out for the crossbowmen...i usually dont worry about them but more than less they start to get annoying because they can really hurt your army...as for wargs they suck against archers..just dont let them charge into them...uruks are very easy to kill with calvary...and beserkers...well have fun....just dont waste your troops against them...they have good defense and attack so hit them from a distance or slow them down with lesser units..
like mentioned before dont waste arrows on the orthanc guards...they will survive and kill you..might not be the strongest unit but they had good defense..
with the pikes i always draw the pikes around with my calvary until there back is to my archers...then let loose. just dont let them come to close to your army...there not the strongest but they can hold the line for long enough to exhaust your troops and dwindle your numbers...
thats all i got...isengard is my fav faction too so...good luck.
