The original Ghostwriter had PLOT. There was sequence where one of Alex's friends was using drugs and actually stealing things to sell to pawn shops. He ended up getting beaten up by his dealers for lack of payment and left in an alley. Thankfully, they found him in time, but they could have helped him sooner. Find lessons like that on a kid's show today.
In another, Jamal is slipping a letter of apology to a shop owner when suddenly the place catches on fire. He doesn't tell the police that it's him in the security camera, but admits it when they find out.
From bullies mugging kids for arcade money, to a waste manager dumping toxic waste, to hacking, this show had merit, and even let you try to figure out the guilty party before the team did.
The new team... SUCKED. The whole Ghostwriter only can use letters thing was worked around since all members had PDA's. Therefore, Ghostwriter pretty much solved everything.
There weren't many moral lessons or risky things to show children. The gang had no personality outside the team, unlike in the original, where personality is well developed and plays a major role.
They just run around, solve something, and gloat. All in all, an insult to the original.