Hussar
Legend
I'm going to strongly disagree there. There is no need for glass cannons. The whole "bang you're dead" type monster thing is just not all that fun. Glass cannons rely too much on random chance. If the glass cannon doesn't get its shot off, it's pointless. But, if it does get its shot off, the players only survive through luck. Whoopee. That's not strategy or planning, it's just dumb luck.It's a problem with the system. There is a need for glass canons and other specialist monsters if the game is to be anything like interesting. If you were using it against a lower level party you design the encounter so that they can take it out before it one-shots them. Or have it shooting at allies, the city wall, etc. Or you might have several combined with tank monsters in a higher level encounter.
Glass cannon is not a good game design. I'd much rather have monsters that fall within a fairly broad spectrum - say monsters that take 2-6 rounds to defeat for a 5 PC party. The 4e monster designs of skirmisher, soldier, etc. worked fantastic.
A monster needs about 2-4 powers to be interesting. That's it. That's all it needs. Anything more than that is mostly pointless and too complex to run. I imagine that if someone sat at your, or my or anyone else's table, during an encounter with say, 5 baddies, 3 of which are casters, and counted the number mistakes the DM was making, it would likely be once per round. People make mistakes with the rules all the time. Making monsters more complicated is not going to fix the problem.