A very competitive yet fun game, without this expansion, well you don't know what your missing.
The people of EA were right on the mark when they made the 9 unique generals, all fitting into there place perfectly.
e.g The USA laser general, if you ask me if it wasn't a USA general it just wouldn't work, thats say they made it the GLA laser general it just wouldn't work.
In Skirmish mode you have the control over quite a far bit of the game. You can control speed, money, allies and even what player has what. I haven't played it online but I heard it is heaps of fun.
Though I find that this games downfall is that EA is now focused on its space version of C&C and not going back to C&C generals. Meaning in the long run, even with the mods, command and conquer will never be perfect. Not with all the bugs we tend to have from making our own mods.