(I hope you don't mind me making a comment- I am ELCA, but was a long time member of LCMS, and go to an LCMS church when not in town for my home church, so since this isn't really a 'what do you think' issue but 'what is it like', I felt it not so inappropriate. Woo- wordy!)
It looks like a great church. I like that a close resteraunt serving German food and beer is listed in the links! XD Hit the Lutheran nail on the head! (The question is, what is the nail posting? Hehe) But for a church (especially a Lutheran one) it is great to have that size if it can stay active and strong.
As for clothes, I've never felt (in any Lutheran church) that clothes were considered by -other- members of the church. A good number at all the (Lutheran) churches I have been to have felt that dressing well was important, because, being it God's day, they wanted to be at there best (think along the lines of giving your -first- ten percent as a tithe- it's the best you are offering). Others felt that coming to church in humility, 'as you are' (As Christ finds us, in the everyday) was more appropriate. Some, in more practical feeling, don't dress formaly because they don't want people who can't afford to drance formaly to feel they are out of place. I have myself felt different from time to time, and I have never been looked down for it either way.
Only other note (I don't think this was mentioned)- In the LCMS, often the communion is limited to members of the LCMS church, or those that were confirmed in the LCMS church. Unlike many of the big non-denom churches you mentioned, Holy Communion is not a fluffy thing to do once every couple months in a special service as symbol, but a serious, very real action of faith you partake with as part of the Church. You said you visited once, so, you may have gotten some of this in service or the like, so I won't go too into it, but it is important to talk to the pastor before taking communion to see at least what Communion is according to the Lutheran church, if not to see what they require before you partake.
Woo- wordy. Thanks for letting an elk have a word : )