that's right!!
持觀光簽證入美國結婚is合法D,
this is the easier way.
but you MUST tell the customhouse that you come to visit!!!!!
>你以為美國移民局要問就問得到?!
that's true,
it's very hard!!
They will keep you on hold forever,(most of time the line is busy anyway)
and may not really answer your question!!

Again!!
持觀光簽證進去結婚是合法的!!!!
but you don't tell them that!!
and if you get married in america, you will get your green card faster!!
>他說 你不知道我們當初移民有多困難
it's true,
it IS very hard, timewise, paperwork-wise....."wait-wise"....
.
>我說 你至少要辦未婚妻簽證
believe me, that's not a good idea!!
他說 那沒必要辦!
it's true, it's just more trouble!!
Listen to his lawyer.

>他就是不要在台灣辦
就是要在美國辦,而且是律師說的"爛"方法!
this is not a bad "method",
it's the easier way!!

About his temper, that's what you need to worry.
When you apply for green card, you'll need joint account, etc..( with a lawyer, it won't be too much trouble, though)
i will tell you some more if you have anymore questions.
good luck!!