Most people are more likely to read the Songs of Innocence & Experience, which is also quite sarcastic at times, but have a very pleasant air of simplicity. In this collection, one of the most famous poems in all the English language is `The Tyger--' in experience. It is in mostly catalectic trochaic tetrameter (meaning a seven beats, alternating heavy and light, but beginning and ending heavy, like: TYger, TYger, BURNing BRIGHT/ IN the FORests OF the NIGHT...). Otherwise, I actually prefer Innocence to Experience-- Experience is sort of like the lame sequel published a few years later; but many people hold the opposite view. Each of the poems in this collection has its own metrical and rhyme scheme, but generally they have short lines, perhaps with a nursery rhyme quality. Usually the lines are all quite a bit shorter than iambic pentameter. I would suggest you read through Innocence and Experience to get a sense of Blake.