The LS does not suck in snow. Your tires suck in snow. It really is that simple. Proper winter tires are the single most important factor in a vehicle's performance in snow.
As for the TC, I agree that it can be invasive at times. This is especially true on the Gen1 ('00-02) LS's, where the TC will kick in at the slightest sign of spin. On my Gen2 ('06) the TC is much more relaxed and will allow a takeoff with prolonged wheelspin as long as it isn't spinning too fast, which is a real bonus in very snowy conditions. Once it does kick in though, you have to back off the accelerator completely to 'reset' it and get power back to the wheels. (Note that both my gen1 and gen2 had Advancetrac, so the behaviour you see might be different with just plain old TC).
As for the TC, I agree that it can be invasive at times. This is especially true on the Gen1 ('00-02) LS's, where the TC will kick in at the slightest sign of spin. On my Gen2 ('06) the TC is much more relaxed and will allow a takeoff with prolonged wheelspin as long as it isn't spinning too fast, which is a real bonus in very snowy conditions. Once it does kick in though, you have to back off the accelerator completely to 'reset' it and get power back to the wheels. (Note that both my gen1 and gen2 had Advancetrac, so the behaviour you see might be different with just plain old TC).