let's talk about dreadnoughts: the classic, the venerable and the ironclad.
personally i do like only the first one: the second is too expensive, the third is an awful miniature, if i will field it i'll certainly convert a classic one (i own the metal one and the plastic one) instead of buying a new plastic ironclad.
my personal two cents: i find myself in the embarrassing situation of losing lots of space marines squads due to some hateful black templars crusades so i said myself: "let's go armour, those bastards can't pierce anything heavier than armour 10... only the power fist (2 attacks charging) can be a problem". in this case armour 13 of the ironclad can be of some help. also a second close combat weapon might be useful. obviously the tactic is to keep the dreadnought ready for countercharge the crusade squad or even bash the land raider that transports them with the close combat weapon.
theoretically, it can work out. but what if i play against other enemies? the problem would rise if i have to play a game against a slower army, like tau or imperial guard... i guess the dreadnought, without a drop pod would be useless... but i hate drop pods.
so? please help me!