I was hesitant about installing this DLC (I got it in a bundle with the rest of the game and DLC). But after a little gameplay, I decided to go ahead.
Turns out, it doesn't give you ridiculous weapons at the start, but when you do find them, there's a nice bonus to them. And the 500 coins keeps you from worrying about spending at the beginning, but later on, you realize how little 500 is. The same goes for the 5 lockpicks.
Bottom line, if you don't have this, don't worry about it. But if you DO get this in a bundle with the rest of the DLC, go for it. It won't ruin the game, just give you a LITTLE edge at the start.