That's a matter of opinion, isn't it? According to Fletch (an insider, remember) the number one complaint from owners is II's system. It's great that you're happy with your exchanges - you're one of the lucky ones. I've been satisfied so far, too, but that's only because I knew from the beginning that "like for like" wouldn't be possible most of the time. If they can roll out a new exchange system that gives me and others like me value equal to what we're depositing, then probably we'll be all ears.
The reality is that people like to complain. Unless they get what they want as soon as they want it, people will complain.
I agree with DanCali- there are a lot of potential pitfalls. Starwood is another high end developer and look at how their point system works and how "easy" it is to get reservations. Not exactly the freedom that one envisions as being ideal.
And, before Disney and their successful system is cited- I don't think it would logistically be reasonable to expect a Disney-like system. Disney started as a points system and, even IF Marriott goes completely into a points based system (like the Asia Pacific) and not an overlay system, there will always be separate inventory because at least some (and likely initially at least most) owners will remain in the current system. That alone will make any new system difficult at best.
Sue- I agree- IF Marriott develops a system than is easy to make reservations in and guarantees me equal value both now at introduction (when they are making things look enticing) and in the future (when they introduce new resorts), then it would be very attractive. That's a huge IF though. The only way I would be convinced that Marriott was offering me equal value and would continue to do so in the future was IF, akin to Perry's suggestion, point valuations of what you owned and point cost of desired weeks to trade into were determined by the fair market rental rates (averaged for the dates across the season owned or being traded into). I'd like to be assured that there was an equitable system in place for now and that will place future resorts into their proper valuation, and not subject to whatever valuation Marriott places on them to entice sales (because I want to be able to trade into newer resorts 5 or 10 years sown the road). To put it simply- if I am giving up a week that Marriott would be happy to rent for $800 a night, then I'd want $5600 worth of rental- whether that's 5 nights in a more luxurious or larger accommodation or 14 nights elsewhere, or even 3 or 4 weeks perhaps in a smaller unit, off-season, or a less in demand locale.
Marriott should be valuating timeshares by some objective criteria- and fair market rental rates are an objective criteria that reflect costs to build, costs to run and demand; it reflects resort quality and destination demand.
btw- That's what I'd consider fair. I am not sure if the Orlando owner who beforehand enjoyed trading into Hawaii, the Caribbean, ski weeks, etc., would be so happy. The new system might be their number one complaint....