i suspect the differences in opinion you are getting have to do with the experience of the individuals you are asking. they either couldn't see themselves making that jump, or they couldn't see themselves making that jump in their current facility. so, when you ask them their opinion on the subject, keep in mind that their own experience is all they really have to draw from. that said, i'll wax philosophical in answering your question.
there are many variables that need to come together in order to go straight into the icu out of school and be successful. some of them have to do with the person, some have to do with the hospital. first, is the icu where you really want to be? are you aggressive/assertive enough to move at that pace and not get pushed aside when things turn south? do you work better getting to know 1-2 patients very well and at a deep level, vs. 5-8 patients on the surface? do you like the detail involved in putting together the puzzle of an icu patient? when the fit hits the shan and your patient crashes, do you want to be at the forefront in getting them stable again or would you rather let someone take care of the crisis and then you take the patient from there? can you navigate the delicate waters of family members' anger and anxiety when their loved one becomes acutely ill and they have nowhere else to place that energy except on the nurse? are you prepared to handle/learn end of life issues, both from the patient's perspective and their family's? those are just a few things to think about. if you answered "yes" to those, then the second part becomes the most important.
secondly, does the hospital where you are considering going into the icu have a track record for successfully placing new grads in the icu? what is their training program like? how long? are you 1:1 with a preceptor? does that person have a successful track record as well? what resources are available to you as a new grad icu nurse, i.e., education and training departments in the hospital, cns's, access to doc's, resource books and material, computer applications and training, hand's on education, etc? how acute is the facility in which you will be working? how long is training before you will be expected to work independently? what is the culture like on the unit in which you will be working? are they receptive to new grads or would they rather beat them up for a bit to see if they can "make it"? when working independently, is the unit very helpful to new grads just off orientation or do they give the attitude of "sorry, you're on your own now"?
i've seen very smart, driven and capable people fail miserably going straight to the icu because the facility in which they were working was not adequately set up to take on new grads. the system failed them and no matter who was placed there, it's likely they would have failed as well. likewise, i've seen people who were not quite ready for the icu get through a very good training program, only to decide later that the icu wasn't quite right for them. where you fall in the middle of all this, and the facility in which you work, will likely predict your success in going directly to the icu from school.