I actually never had a single spoiler dropped bit i don't have any thing social (no fb, or twitter etc) but i got to the same as you. Made it to half way through season 2 and stopped. Thankfully started watching it and I'd forgotten enough of the intricacies to not notice each difference aside from obvious ones (no Strong Belwas) but i started noticing shit at season 4 onwards which pissed me off