In general, platinum is worthless. This is coming from someone with just about 700 nights in the program. I logged 500+ of those before I really opened my eyes to the other chains. I'm platinum this year, but I'm not staying at Marriotts this year. I'm just going to hold onto the credit card for a few years (15 elite night credits per year) until it pushes me over the limit for lifetime platinum, and then I'll dump it.

I have nothing against Marriott properties. There are lots of them, and I like most of them. I just haven't had too many great upgrades / experiences due to my being platinum. Marriott lounges are great - but for now, you get them w/ gold too.