I dunno about having vows.....but I do like the handful of weddings I have been to where the Imam actually gives a little speech/lecture during Nikkah where he talks about duties of husband/wife, advice on making marriage work, to love each other...etc..very sensible/practical stuff for both. I thought it was great.
yep some Imams give really good speeches.....i absolutely love it. as long as they are not ridiculously long.