Not at all...marriage does NOT guarantee admission to the USA.
Each case is evaluated to assess the validity/sincerity of the marriage, the economic and other viability of the couple once they reach the US, and more.
Many couples, even those with kids and long marriages, are turned down.
A key factor seems to be documentation...photos, receipts, certificates, letters...all kinds of stuff. When T. Susan got her visa, she went in with
over 10 kilograms of papers!
But yeah, we are a bit