Far from evil... I-deas is (was) an extremely power CAD program that was far ahead of its time. What is "evil" is what UGS did do the I-Deas product when they introduced their insanely incompetent "NX" product... (last version I used was 5).
I-deas has to be seen in 3 stages... 1) prior to "Master Series" - when it really was very difficult to learn due to lack of visual iccons, 2) release of "Master Series" - when SDRC released the product before it was ready/functional ... and was sued because of that and sustained serious black eye, and 3) when Master Series finally matured (release 1-2's modeler didn't work, 3 was a breakthrough, 6 really got on track etc). By the time Siemans and UGS got their evil clutches into it, I-deas was an absolutely marvelous mechanical design drafting and analysis product.
Anyone familiar with CAD boolean operations would have to give I-deas a whole lot of credit. The current linear design format of (for instance) Inventor is simply childs play compared to the power of I-Deas.
All UGS wanted from I-Deas was their Team Data Manager. They threw out all the design features and THAT, my friends, was TRULY criminal.