Pros

• nice drip economy
• needs no clicks to generate money
• reasonably high trash cost

Cons

• takes a while to profit

Thoughts

• can sometimes be played unprotected, but you then have to watch out for Whizzard: Master Gamer, Imp, Magnum Opus and Bank Job
• so it probably needs some protection, the question is: How big should the price tag on PAD be to discourage the runner from going after it?
• I'd say a server costing 2-3 credits feels about right, now the runner has to spend 1 click and 6-7 credits to get rid of the Campaign, which needs a full turn with Magnum Opus to recover from
• Pop-up Window would be good there I guess (especially if there are more assets you can put in the server if the runner does trash this)
• or other cheap Ice
• This should give you an opening to play something nice (or steady credits)