Many players consider Striker the "noob" subclass, due to the noobish Panic Slam. I agree, it is pathetic and excessively noobish to Panic Slam one poor soul just because you are about to lose a 1v1 encounter. Having said that... Striker is by far one of the most challenging classes to use effectively. Especially when it comes to using FOH effectively (i.e. actually getting a multi kill with it). However, once you do learn to use Striker correctly, it is by far one of the most fun and rewarding subclasses to use. Watch the video, great highlights and examples of pure Titan Wreckage!
https://youtu.be/08Rer9FNve0
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No bubble is harder,hence why no almost no ones uses it