I have taken Math 118 online and, for me, it was difficult but not impossible. I took Math 015 last summer and did very well in the class, but it really didn't prepare me at all for 118 (I had been told that if I wasn't going to take a math higher than 118 there was no reason to take any of the other academic skills advancement classes for math).
It's difficult to compare Math 015 face-to-face and Math 118 online because it isn't the same type of math. But I think that for someone who may need to hear a lecture and see problems being worked out, face-to-face is obviously a much better choice.
The types of math covered in 118 were things I'd never heard of and/or never worked with prior to taking the class: Venn diagrams, lots of statistics-related work, finances (such as multiple ways to compute interest, installment payments), etc.
There are two exams for the class: midterm and final exam. At least for my class, the midterm covered everything from the first 1/2 of the class and the final covered everything from the second 1/2 of the class. We were given a sheet at our proctoring site that had a few formulas on it, but it certainly didn't have everything on it. The two exams are very weighted; combined they accounted for 70% of the total score for the class. All the other work you do for the class (a few discussion boards, weekly homework, section quizzes) really didn't count for much in the whole scheme of things.
The way my online course was set up (and I assume that all online courses for Math 118 are similar) is that you have your textbook, a second book with the answers to the problems from the book, and access to My Math Lab where you'll do your homework. Unless someone is very good at this type of math, I would definitely advice them to work out the book problems in addition to the homework. There are quizzes that you'll take in My Math Lab that can be pretty hard.
I don't want to scare you off from taking this course online! Just know that it can be very time consuming. I earned a B in the class, which is really good for me, especially since I didn't do very good on the midterm.
I'm not familiar with the instructor you mentioned. I had Christine Robinette out of ... Marion or Muncie?? Sheesh, it's only been a few months and I can't remember where she was from. She was very nice and quick to respond to questions (such as when I clicked on the "Ask your instructor" link in the homework section in MML).
However you choose to take this class, good luck!