I like David Cronenberg but I have to say - Scanners I is a *boring* movie. Just my opinion and I'd certainly prefer to say 'I love it' but sadly... I can't.
It has two fantastic FX set-pieces (one near the start, one at the end) and that's about it. Very slow, very dull, hard to care about the characters or the plot...
And while there are some stylish shots, overall the movie looks rather bland.
On the other hand, I found Scanners II very entertaining. There is some definite cheese in there (which you know you're getting when the movie starts in a video arcade) but there are also a lot of fun ideas, plenty of action and a comic-book style plot. I was slightly reminded of RoboCop, and that's a good thing. Plus I think Christian Duguay gives the movie considerable style.
So that's how I feel. If you disagree, that's fine. Everyone is entitled to their own opinion and entitled to enjoy whatever they wish :)