Cons: I didn't mind the location in Vancouver, but my problem with having it in Washinton in general is SALES TAX. I freaking HATE sales tax. In the dealers room they mainly just pushed the prices up to accommodate, so everyone ended up paying basically regular price on a lot of things that could have been below regular price (manga) had the con been in Portland. I also agree that I think of Kumoricon as an OREGON convention. Sakuracon is for Washington, Kumoricon is for Oregon. I know it's just across the bridge, but there are state borderlines being crossed.
Pros: Last time it was in that area we had GORGEOUS weather, and that park was really really pretty and perfect for photoshoots.
Honestly I can't remember any details of the hotel since it was 4 cons ago now, so I can't say anything about that. I don't like the split hotel idea though. When Kumoricon was at the Red Lion in 2006 there were two hotels literally just across a couple parking lots that was okay (even though only the Red Lion had the events). If all of the events are at the Hilton and they're just reserving the separate hotels for hotel attendees to stay at then I have no problems with being at "two hotels." TBH I don't think there are enough events and panels to split it into the two hotels.