THere are some good english dubs (like FMA) but american Dubs, even today, are still censored and in some cases with modern ones, even heavily politicized (the infamous Gamergate line in Prison School) and thus you end up watching a watered down version of the series.
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Deleted member 93956
Or the dub is literally just inferior to the original because 98% the time they just get a cartoon VA team you've heard a billion times already and call it a day, with the half assed-ness it ensues, not even accounting for the lost in delivery.
They literally change entire conversations, which make in turn Eren sound much much whinier than in the original. That's a bad translation in any book.