with 5 years of teaching experience you really don't know enough about any curriculum to call it 'crap'. That's far too strong of a word.
Yes, your big 5 years certainly hasn't allowed you to see much variety of curriculum, much less enough of one curriculum to really be an accurate judge.
From what I've seen so far with my kids at SAS, the Chicago Math is good for young children - not sure if the school uses it beyond the primary school anyway & if they do, I'd have to take a look at what it entails in the higher grades to even begin to make any kind of judgement. As far as English curriculum goes, well, my kindergartener is doing a fine job of learning to read and sound out words, etc. They don't focus on spelling yet, but, surprise, surprise, with all the letter sounding they work on, words that are spelled like they sound phonetically get spelled correctly - and those words that aren't spelled like they sound would have to be learned via memorizing anyway.
My kids are doing more academically at SAS than their similar aged cousins are doing in the US - I have no complaints.