Very wrong I'd say. I was able to read more at 3 weeks than I could with 3 years of Spanish. Spanish might be easier than Latin, but verb conjugations and irregularities in the grammar is no joke. Esperanto gives you a detour around all of that.
I suspect that is at least partly due to Esperanto content using a smaller vocabulary. Irregular Spanish grammar makes writing/speaking perfectly harder, but in my experience it's not a big barrier for reading.