well, the wrangler is okay in most situations, but there are some where it's just horrible overpowered if played right. In particular, it turns Gpit B into a nightmare. If you build a level three at spawn and carry it over, you can wrangler-jump to the roof of b. Turn out that as long as you don't have the wrangler out (not: have another weapon out) you can pick up buildings. I've seen guys wrangler jump and use the delay of the rockets to pick up their buildings as they jump. Once you get on top, put the sentry down, build a tele and dispenser, and have another engy (who has bee building a sentry and dispenser at spawn) come on up. You put your wranglered sentries down and proceed to spam the two tunnel entrances to B with concentrated rocket and bullet fire. A third engy (optional) fixes your stuff, spams with the pistol, and leaves his sentry on the back side of the roof.
Basically the only things you have to worry about are snipers (who can't get the shot because you are either hidden by the point itself or constantly shooting them), soldiers who manage to sneak all the way around from C (possible, but your team fails if they actually get on the roof, and not a problem if you have three engies due to the third sentry), or uber demos (no other class can land enough damage to destroy a sentry with the uber. If you pick up your sentry and run to the other side of B, they won't be able to get to you before the uber runs out, and your team can mop them up. You don't even have to worry about spies if you use the build tele in spawn tactic.
Basically the only way to beat this technique if the defending team is half-competent is to use an uber demo to force both engineers to pick up their sentries, then either snipe them or jump soldiers up there to take them out while they have their sentries picked up. You have about a two second window to work in, and if they have three engies up there, the engies can just run to the safety of the third sentry. The uber would have to run all the way around B to get to it. If they do, the original two engies just run back to the first spot and set the sentries back up.
Damn, now that I've seen that, I can't believe I don't do this more often. The only counter is to force the engies to pick up their sentries and then kill them while they do that? Crazy....
-Chipbuster (formerly known as chipbuster69)