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No, dders is right, "we" is the only correct pronoun for the sentence. Although it is true that many would say "us", it is grammatically incorrect to say "as us". A trick in English is to complete the sentence after the pronoun. For example: "My sister is as tall as (me or I?)" "Me am tall" or "I am tall". The latter is correct, thus it should be "My sister is as tall as I".
"We" is grammatically correct (and only idiomatically correct, in the U.S. if you're among people who pay strong attention to grammar--to the point that "normal" people may be confused). "Us" is idiomatically correct (though not grammatically correct, unless you're of the "usage determines correctness" school of grammar).
But English has linking and assimilation that make understanding most spoken English extremely difficult for beginners. The extensive use of idioms (including verbal phrases) especially in American English makes for some tough sledding. And as to declinations, is simpler better?
It's just the same as "Hi, it's me". Even though it is grammatically incorrect, 99% of English speaking people would eye roll at anyone who would use the correct form of "Hi, it is I" for presumed snobbery. So even though "as strong as us" is, indeed, incorrect, it is just another quirky form that got such a strong hold over the speakers that the correct "as strong as we are" is almost pushed to redundancy. Interesting little quirks of a living language :)
"They are so strong like us"--not used. Ever.
"They are so strong like we"--akward / poetic / unusual, and means something a little different.
"They are so strong. Like us." --idiomatic, but means something a bit different.
"They are so strong--like us." --idiomatic, but means something a bit different.
"They are so strong, like us." --idiomatic, but means something a bit different.
"They are as strong as us" --most idiomatic answer
"They are as strong as we" --formally most correct, but rarely used in speaking
If they are weak, and we are weak, it is correct to use, "as strong as." If they are medium-strong, and we are medium-strong, it is correct to use, "as strong as." If they are very strong, and we are very strong, it is correct to use, "as strong as."
In contrast, you can only say, "they are so strong. Like us" (Or any of the punctuation variants) if they are, in fact, very strong (and we are also very strong). Because you're not making a comparative statement. Instead, you're making an absolute statement, then tacking on comparison. It's not the same thing.
TLDR: "So strong as" and "so strong like" are not comparative phrases, in english. Neither is, "as strong like." "As strong as" is the comparative construction. Use, "as strong as," when comparing.