I don't know what you mean by "suiting", but I'll assume you're asking "Would XCOM games work well on an Alienware computer?".
To which, I'll respond:
It depends on your specs. If you've a fairly recent model of an Alienware computer (and the XCOM games aren't badly optimized), then your computer can probably handle the load the game would put on it. Just to make sure, I suggest using this website while logged into your Alienware computer.
In the menu that lets you search for a game, find the xcom game, click the option, then click the "can you rin it" button. You may need to install a Java applet for it to work, but its a pretty good site for finding out if your comp is strong enough to handle a game of your choosing.
I hope this helps 