First post in this thread, but I've been playing Black version for the past couple of weeks and just got the final badge. My pokemon were higher levels than all of Drayden's? dragons, but damn they were tough to take down. I also just caught the virizion and the other legendary. Plan on using virizion to challenge the E4 since I'm lacking grass and fighting.
I really enjoy this game tho. I picked up Platinum when it came out, but I never got into it and I didn't even finish it. B/W reminds me a lot of the original RBY, and I'm glad the pokemon were all new compared to some of the previous generations that include the older pokemon before you beat the E4.
I have no clue about EVs or competitive battling, but it seems like a lot of work and time to raise them certain ways. It is interesting though!