The $450 annual fee is rather typical for the premium cards. To compensate it they offer unique perks, in case of the Delta Reserve card from American Express it is the easier access to the elite status which you can get with the Miles Boost feature, the Companion certificate and the access to the Delta Sky Club. However, with the $450 annual fee those features are worthy only for those who fly almost solely on Delta and fly a lot, enough to spend at least $30,000 a year.
If you don't fall into this category, then don't bother acquiring this card. Honestly, there are better cards. There are plenty of travel cards which are universal, have similar or better bonuses and don't require such a bizarre fee. In our opinion, $450 is way too big of a fee for even the perks that the Delta Reserve is offering, and you can save yourself those $450 by applying for another card and having similar bonuses, but no fee.
Check out the Discover it® Miles, there's no annual fee at all and it collects miles nicely over the year. Besides your miles will be matched at the end of the year meaning that you'll get twice as many miles as you've earned (for new cardmembers only).