I think Serb1389 is best equipped to answer your question. He is a seminary student whose father is a SOC priest.
From a personal perspective, I have never heard of any financial problems/irregularities within the Church, but to be totally honest, even if they did exist, I wouldn't know of them (as I have no interest in the Church administration).
We visited a Serbian priest once a few years ago, and he was nice but the secretary and other serbians were not so friendly. They didn't seem to think we should attend if we didn't speak the language.
This was terribly upsetting to read. I would tell you, whoever said this to you is 100% ignorant and 100% wrong. Can I ask you where you live? Maybe I can recommend a good SOC.
About the language...
My parish is predominantly immigrant Serb. Liturgy is in Slavonic. After Liturgy all events in the basement hall are 100% Serbian. Even though I am ethnically Serbian, I am not fluent and I think it is more accurate to say I do not speak "Serbian proper". Serb1389 likes to call my dialect "village tongue" or some derivative thereof.
I primarily speak English at Church and only speak Serbian if I'm talking to an elderly person. On occasion, my wife and I feel a bit like outsiders, but our priest does a good job at making us feel welcome. We have a weekly newsletter and he knows to give us ours, in English. At the end of the day, my reason for being at Liturgy transcends language, so nobody could keep me away with a silly comment (like the one said to you).
I'd remind anyone who has that attitude that you are going to an ORTHODOX CHURCH, not a SERBIAN Church.
In terms of differences...
It is tough to say. I am at my 5th Serbian parish (we've moved a lot) and there are some differences between each parish (especially between the ones in Canada and the ones in the USA). One obvious difference you should be aware of is the celebration of Slava.
If your husband is 1/2 Serb, than he has a Slava. ONLY in a SOC will you find a Slava celebration. This is one reason most Serbs don't stray from the SOC and would obviously be a prerequisite for any Orthodox union in North America.