This tactic is used my many and is especially noticeable in Supremacy where everyone and their mom runs a shotgun. The ability to slide is great and very tactical especially around corners, and used with a shotgun this tactic can make any decent player look like a pro with this move. Now this takes some skill to pull off just like a headshot with a sniper now that they have the flinch mechanism. The shotgun-melee is also a widely used tactic and ensures a kill at close range and can be spammed at warp speed it seems like sometimes. Combining the increase movement speed from sliding (or blinking for that matter) and a shotgun-melee, the opposing player has no chance for a defensive stand other than a great shotgun shot (similar to getting domed by a sniper around a high traffic area). The only thing I ask for is slower handling for the shotgun when moving this fast, or possibly a slower melee strike when equipping a special weapon. A Sniper kill rewards a great shot while shotgun kills often are just a matter of proximity to target. The ability to hip-fire is a huge advantage over any gun type in the game barring Last Word possibly. Snipers, Fusion rifles and side-arms can counter a shotgun only if they are running at them in the open with a lot of space between them. No other special weapon or primary gets this advantage of sliding, blinking, melee to add to the effectiveness of the gun. This is why shotguns are OP in this current meta. This tactic is very over powered in the hands of a Warlock because of the ranged melee ability along with the Titans and Warlocks ability to Regen health after a melee kill. Hunters get no love in this category.