Lots of advice on things to do strategically. If you can't beat junkballers, just play them even more, trying out different strategies/play patterns until you can beat them.
The first player we all hate playing at lower levels is the classic pusher.The only way past them into higher levels of play is right through them, by playing them a lot till you can beat them handily. The next challenge are the really good junkballers. Same thing, though. Seek them out, play them a lot till you find ways to just dismiss them and move on.
If it ticks you off (or is even just mildly annoying) to have to play people like this, just think of them as tools available for you to become a better player.