Fraysh

Some of what you guys might be experiencing is due to speed boost, which a great deal of players have in pvp(at least the good ones). Basically speed boost negates every slow power in the game, whether it's caltrops, tar patch, freezing rain, snow storm, whatever. Heck it pretty much negates travel power suppression as well. So if you see someone superspeeding around through slows like they are nothing, and never being affected by travel power suppression, it's because they have speed boost on them.

The only stalker set that could be even considered is overpowered is spines. The rest are pretty bad. AS itself is a pretty bad power, sure it's amazing for killing newbies and AI but it's lackluster at best against people who know what they are doing. Impale is downright godly in PvP though. I would still consider blappers way more overpowered than any stalker build though.