So after a few days of owning Guild Wars I've decided to focus on an Engineer, specifically using the grenade kit as opposed to being a turret-y engineer like one of my friends has. I think I've gotten the hang of landing grenades quite happily and switch between weapons and the kit fairly easily.
Any advice on playing this style of engineer in dungeons an pvp later in the game?

In more general terms I am enjoying the events and personal story far more than running through any other MMO's with the possible exception of some dungeons on DDO but that was mainly due to playing whilst voice chatting with party members I knew whilst doing ridiculous things.