The Blue line RER runs straight from CDG and gets you pretty close to the Eiffel tower, depending on where you're stay. The RER is less of a subway and more of a regional train. Pretty easy from the airport.
If you need to transfer to another line, it does up the difficulty but it's not too bad.
Aside from the language barrier I've found the Paris train/ subway system to be one of the more efficient and intuitive systems I've experienced.
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