As for going out where you don't speak the language; my brother, my life changed because of my first encounter with a tableeghi was a brother from Algeria who went to US, and came to Pakistan for da'wah, and his words were wise and full of Ikhlaas. Otherwise, I'd still be going out with Dawat-e-Islami eating Halwa.
A) Yes, they DO take it from the ulama joining or at least supporting the work of Tableegh, but not always. I mean, I know a brother who actually gave me the cassettes and booklets of Mufti Rasheed Ahmed Ludhyanvi Rahimahullah, and that brother was a tableeghi. Mufti Rasheed Ahmed sahib Rahimahullah wrote about the 390 million thawaab thing of Tableeghis, but that brother still gave me his lectures.
Until or Unless we understand that Tableegh/Dawah, Tazkiyah/Tasawwuf, Jihad/Qital, Dars/Tadress, Radd/Tahqeeq , are all parts of the effort of deen, we will keep pointing fingers at each other. That's the reason why I love Maulana Yousuf Ludhyanvi Shaheed Rahimahullah, he gave khilafah to the Ulama from all the Aspects of Deen i.e. Jihad, Tableegh, Radd, Ta'leem. Tableeghi Jama'ah is doing Tableegh/Da'wah, and if we leave the brothers saying " oh ! they don't do Jihad, or OH! they don't have much knowledge of Islam", then we are adding to the problem. It's good to see that Ulama are now going with the jama'ah more and more, and now many things are being changed, walHamdulillah.