Advice
 

We're leaving for Paris on Saturday for our honeymoon and we wanted to know if we should take a shuttle service to our hotel in the Latin Quarter or if we should just take a cab from the airport to the hotel. Thanks.

since "advice" could be asking absolutely anything about anywhere in Europe -- you should repost this putting what you want to know in the title . . . . .

Since you gave a choice, I suggest taking a taxi. Personally I don't care to take shuttles.

Taxi

If it's a hotel shuttle I'd take it; the normal routes in RER and bus are find but since it is your honeymoon you should splash out, it will be expensive, and take the taxi.