If you mean Legion dragons, awareness of enemy threat range combos has been historically the path to not getting assassinated. Dealing with fast, hard-hitting warbeast: Create an alluring sacrifice-threat (solo about to earn a Contol Point, or light warbeast poised to take out a significant enemy asset) followed by your favored retaliation method. Don't make it your warlock unless it's a tank or has all the transfers, preferably both. For no KD, I've appreciated the Stationary effect when I can include it, as a back up strategy.
Which warlock/BG? In MK2 I could take nearly any warlock and use the increased diversity of tactical tricks (Power Attacks, self slamming, etc) to squeak out a win against nearly any army. In the current game, an all comers list usually relies on the S and A tier warlocks and builds, unless you are a savant with a lot of reps to practice and hone your specific tech. Experience level of the player is still the most important factor in this game! I still like to build TB armies like I'm playing MK2, massive diversity of model use, but the win percentage against 'establishment' armies is significantly lowered. Best advice, read the lists of tournament-placing TB armies, and practice their use as they are designed to be able to handle the current meta armies (or not! as is shown by TB place finishing stats?)
For less general counter tactics, posting your opponent's complete 'problem' army list can help to get more specific answer(s). Cheers and happy snacking!
Thanks for your thoughts. I have been trailing kc alot more as I find tough is not cutting it with scythean abounding and though champions are awesome they fade under thrasher from same beast. With kc I find I have more chance to sit and hit without relying on survivability. Tried many casters with mixed results. Would really like to make grim2 work.