I thought this one was very good. Dr. Burr got a little broad toward the end, but I really liked the character-building.
The only reason the security system didn't work was because Silver Monkey had already infiltrated the mansion as hired security. The goal was to keep people from getting in, but they'd already gotten in. And if you ask me, he was disguised as Agent Smith, not Coulson. Very Hugo Weaving-esque design there.
It sounds like this ion core or whatever they called it is going to be a recurring story element. Which makes more sense than having the bad guys only try for it once and then forget about it forevermore.