I must admit that it was not any lack in the Litvak Yeshiva World that caused me to leave. As long as I was in the Mir Yeshiva in NY, things were great. And coming to Israel would not have been a problem also because there was a Litvak  kollel in Safed that I could have joined. Rather I got involved in Breslov. And you can understand how that might come about since Rav Nahman was in fact a great tzadik. Still, the effect on me was to get me off track. [And in spite of the greatness of Rav Nahman, on occasion people that get involved in Breslov do tend to lose the way, close the Gemara]. The best idea is to stick with the Gra and straight Torah of the Litvak world while at the same time to benefit from the important advice and ideas of Rav Nahman.

One  of the great things I learned in the Litvak world: the importance of Rishonim Mediaeval thinkers. [This mainly refers to the commentator of the Gemara, Tosphot, Rashba, Ritva, Ramban, Rosh. etc.].But by implication it also refers to the Musar and world view philosophy of the Rishonim.

Also I learned the importance of review. 

However not enough emphasis was placed on the Gra.

=And that is the only thing I see amiss in the Litvak world- not enough emphasis on the Gra. [for example the letter of excommunication that he signed and yet is still ignored. ]