I was far from bored by the end of the trailer. If anything I think more trailers need to be more representative of the film itself, rather than just being FLASH BANG WALLOP <MOVIE NAME> HUZZAH in 30 seconds just because the world says so.
Thor is the kind of franchise you'd think of as having epic undertones, multilayered stories steeped in nordic symbolism (sadly lacking here >:{ fucking western society,) etc. Key word here being epic. Needs a bit more length to pack in a bit more.
I mean, you could argue that it gives away too much, I could argue that it giving me more to chew on now makes me want to see it later, which it does.