I honestly don't like Drilbur; it can be dealt with pretty easily (Snover and such), but it's really centralizing. I know, I know, centralization doesn't conclude brokenness, but when to go out of your way just to check it, it makes teams a lot less diverse and more centralized, which kind of makes the sport less fun. The thing that makes Drilbur kind of annoying is that all its checks can be easily dealth with. Shroomish gets owned by Natu, and Snover is schooled by Wynaut, Larvesta, and Stealth Rock (plus some more rare stuff like Murkrow). A proper sand team can be nearly invincible...
Scraggy, on another note, is annoying to face, but since Mienfoo is everywhere, it's not really a big deal.
Why was Murkrow banned, unbanned, and now a suspect again? I feel like these suspect tests are only here to promote activity rather than do what they're supposed to do in balancing the game more.