With the PS3, Sony did a very good job on system security. It may be hacked now, but it took an enternity (in hacking time) to do this. However, with the PS3 compromised and with Android being the main OS, will NGP hold up for as long? Nearly as long?
3DS certainly hasn't lasted very long, if you believe the claims of R4 and acecard, but (then again) security has never been Nintendo's strong suit.
I haven't heard of the claims about the R4 and acekard, but I'm assuming that they are claiming the 3DS can still play back-up DS games. If that is the case, I wouldn't say that this is a failing of the 3DS' security simply because it is too late to add security to the DS game-carts that would allow the 3DS to tell the difference between a legitimate DS game and the pirated DS game.
With that said, the time it takes hackers to exploit systems seems to be very varied; and what they seem to be able to accomplish with initial exploits is also very varied. Some times the hackers are able to think outside of the box and do something the system designers never though of, and this tends to result in massive success early on; and other times they must figure out how to bypass all security one measure at a time.