Yes, a money scam at the heart of it but there are more issues at play here:
Enron's accountants appear to have been in on it, or at least aware of what was going on.
Enron execs were still pushing their employees to buy stock when they knew it was about to tank. Many lost their life savings.
And the biggest possible scandal, even tho there has been no real evidence of it, is that Enron gave millions to lawmakers, both Republican and Democrats, and that may have influenced policy/regulations/laws in their favor.