Many so-called Messianic groups have a problem. If the description you find here fits your rabbi or leader, you should consider finding other community in Messiah. Rabbi Schiffman nails this one. See his thoughts here.
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Messianic Jewish Musings 
Dear Derek,
This is an amazing post. I have had this discussion over and over again with people about this subject. I’m not sure why it is such a hard concept to grasp, but I think that it may be due to a few things:
1. An overall rejection of the legitimacy of non-messianic Judaism
2. An overall ignorance of non-messianic Judaism
3. The carry over of evangelical Christian leadership constructs into messianic Judaism.
I can’t put a real number on it, but it seems as though the overwhelming majority of MJ are terribly uneducated…and I’m not even talking about a rabbinical education. I am far from a scholar of ANYTHING, but I drool just thinking about studying traditional Jewish literature and I have the uneasy feeling that a LOT of MJ leaders have candyshop libraries. I think it’s time to go to whole foods with these guys. I’m backing off now…as the author quoted “It is easier to be critical than to be correct…”
I could go on for a while about this, but I rarely read long blog posts or comments :)
p.s. Derek I know it is hard. I admire you continuing to try to bring gems from the Rabbis in your teachings at TD despite being berated at times for doing so. I admire you for your conversion also. Regardless of what one thinks of it, it openly displays a concern for halacha within MJ…something that is desperately needed.
Aree Ogir
as an edit to my above post…” overwhelming majority of MJ” should read “…majority of MJ ‘rabbis'” sorry. :) Not trying to be a jerk, I just want to express my frustration with the situation. I hope and pray for a better future in MJ. I have grown a lot in the past four years, and I know we have to be full of grace toward one another in this.