S1–2 are, by and large, crap and ridiculous to the point that the utterly unique grungy/mid-00s/Welsh/Cardiff/messy/bisexual/hypersexual/alien flavour soars into "so bad it's brilliant"
S3 is a televisual masterpiece
S4 is ... alright? Flawed, but not as bad as people make out
What are your thoughts on Torchwood?