Don't be concerned panda. The convenience of the CR alone (easy walking distance to MK, being on monorail line, being able to view Wishes nightly from multiple areas in the hotel, etc.) will be worth the extra money you are spending. Of course, one must ask oneself whether ANY room at WDW is worth $500-$600, or more, per night. But that is beside the point.
My family and I have stayed at the CR for the past four years in a row and are going back for a fifth year in a row in April. We had originally booked a stay at the BoardWalk Inn but started to miss the old CR even before the trip, took a family vote, and decided to change back to the CR!
No hotel is perfect - for the many thousands of Pounds you'll be spending for a fortnight stay at a Deluxe Disney Resort it's likely there would be something to gripe about at any of them. My biggest complaint about the CR is that its age sometimes causes issues with the guts of the hotel (electrical outlets in the room not working, broken sliding glass balcony door handles, etc.). However, its location and charm more than make up for those things in my opinion, which is why MANY people have such a deep affection for the old gal.
Don't drive yourself crazy reading Trip Adviser reviews - again, you can find negative reviews about ANY hotel. You are going to have a great time.