If your wife likes her hotels busy, frenetic and expensive then she'll be in for a treat. Atlantis gets mixed reveiws because of two main reasons
1. It is isolated at the end of the Palm Island so not close to anything else; therefore drinks and food are at a premium and you have to get a cab to see anything else at all, including the huge shopping malls.
2. It gets very busy with tourists and look-sees
For first time visitors it will probably blow you away because you haven't experienced anywhere else in Dubai - those that have been after staying elsewhere in the City usually jusy go once.
Personally I wouldn't stay there if they paid me to I prefer to be on the mainland within easy reach of malls and alternative places to eat out but each to their own I guess.
As Swiss says official taxis are easy to find, very cheap in comparison to the UK and metered so you also know the price at any point and there is no need to haggle or bargin over the fare.
And again As Swiss says there is so much choice for style and price to eat out that you could drive yourself mad choosing where to go in a 7/14 day holiday.
The malls have everything from McDonalds to high end fine dining and everything, even the food court, is clean and super efficient in comparison to home.
Here is a video that you might enjoy about what's available at Dubai Mall in a specific area known as Downtown - there are another 5 malls just like this one, albeit a bit smaller because this is the biggest one.
Hopefully that will give you an idea of what to expect. To get here from Atlantis will take around 30 minutes by cab
The prices for most things are roughly similar to the UK, some things will be cheaper like gold, jewellery, watches, rugs, linen etc and some things will be more expensive and of course it depends on the exchange rate which isn't so good for the £ just now.
There's Harvey Nichols, Saks 5th Avenue, Bloomingdales, Galleries Lafayette, Debenhams, Marks and Specer, Ikea, Zara, Next, Warehouse, Oasis, Nine West, Dune and then all the designer stores and much, much more. The malls are open till 10pm during the week and midnight at the weekend so a fantastic place to sunbathe all day and shop all night.
So have fun planning and take a look at some other hotels too - plenty to choose from on either the becah or in the city