What?
Romario played in the era when Defenders were actually good as you always say. Today, all defenders are crap (your words), so let's compare stats of Romario playing against good defenders, and Mueller playing against crap defenders.
Romario for Brazil
70 games --- 55 goals
Mueller for Germany
58 games --- 24 goals
Romario kills him there in every way imaginable, and at a time with much stronger national team play.
Romario for PSV
142 games --- 127 goals
for Barca
65 games --- 39 goals
for Valencia
12 games --- 6 goals
Romario in Europe
219 games --- 172 goals
Mueller for Bayern
262 games --- 101 goals
Romario with 43 less games and 71 more goals.
Please tell me, what makes Mueller even half the poacher Romario was?