4 is an average score for IR - so it's not low...but it's not high either. It's still the case that most schools (even the top ones) are not using IR, and those that are looking at IR seem to be mostly using it as a + / -. If you score 1-2-3, that's a minus. If you score 6-7-8, that's a plus. If you score 4-5, that's a shrug.
I don't know, however, whether IR is considered for scholarships or financial aid. Financial aid is given by the school, so I'd be inclined to think that they'd view IR the same way they do for admissions. You might try asking some admissions consultants. We have a folder on our forums where you can post questions to adcons.
Scholarships are an entirely different matter - any scholarship can decide what factors it wants to consider. So there, you're just going to need to dig in and start researching. Find out what the scholarship applications say they consider. For the ones that you think are promising, call them up or email them to ask more questions. You obviously won't want to say, "Hey, my IR isn't great - do you care?"
But you can ask things like "which factors do you consider most important?" etc. (You might also ask admissions consultants for their advice re: how to ask these delicate questions.)
I'd love to know what you hear from any admissions consultants - if you are able to find out anything useful, please stop back in to let us know. Thanks!