I'd much rather fate style bosses, perhaps with more interesting mechanics. Otherwise it just leads to ridiculous stuff like people getting angry when they don't claim, people claiming and holding and trying to charge gathered groups to pay them to be able to fight the boss (as often happened in ffxi) people using claim bots (also in ffxi) making it difficult for legitimate players to ever fight them, people trolling others especially if the boss despawns after a fight, someone can claim then wipe intentionally.

More interesting fate bosses would be great, have more rewards come from them, because as it stands the things you can buy from farming odin/behemoth are pretty lackluster. As someone mentioned earlier, some invasion events would be pretty neat too.