Yea, no doubt... After I bounced my Celica off a brick mailbox about a month ago, I had some issues with how the celica handles in snow. But Since I just bought the car a while back, It's been taking some practice getting used to it.
In light snow, it's not too bad, lots of wheelspin, and the ABS seems to hinder winter driving more than help it. the fact that it exhibits major understeer and is nose heavy doesn't help either.
I decided to get more aquainted with the car to improve my winter driving performance about a week ago. It was a no brainer, my previous car, a 94 escort, seemed to handle better in the snow than my celica, but keep in mind, I owned that thing for five years, and in the beginning, I has some close calls in the escort as well, the fact that i had a shitload of performance and suspension mods on the car didn't help much either in winter (it was set up to autocross in nice weather!).
I took the time to go in an abandoned parking lot when there was about 4+ inches of fresh snow on the ground. Lots of open space with no obstacles to hit. I noticed how easily the car would do donuts when I gently pulled up on the hand brake (under 20 MPH) it was like I was a little kid again on my big wheel! I had a blast!
I also tried some cornering, noting the point when the ABS would kick in, when the car would begin to understeer, and then, after about 20 minutes, I was able to combine braking, accelerator, hand brake and steering to control the car no problem; Keep in mind, I'm still runing on the stock yokohamas. After about a half hour, I was drifting around the parking lot, doing donuts and getting it to corner almost as well as it does on a dry road. Like many have said, it just takes some practice.
Also, it may sound stupid, but what can help you out is a simple fix... throw a couple of bags of kitty litter in the rear cargo area. this serves a dual purpose: First, it puts more weight in back, which will help correct some of the understeer in the snow, and second, in the event you get stuck, you can just spread some of that kitty litter around your tires, and it'll give you the traction you need to get un-stuck when rocking back and forth just won't cut it.
I'm a lot more comfortable with winter driving in the GTS now, I don't even need the kitty litter at this point. it just takes a little practice, that's all.