I've been playing with this list for a few games and I've noticed a few things. I should point out that my gaming group and I are newcomers to this game, so the issues I have with the titans can be explained as something I'm just "not getting". I and a friend recently played a series of 3500 point games and we noticed a few things about the list; he was playing space marines with a pair of standard warhounds,and I played TS with a reaver and a few Silver Towers. The reaver did not impress and sort of became a joke. We actually took to calling the Beam of Power the "Beam of Impotence" instead

. The only time he ever did anything was when I walked him right up to a clump of my my opponent's formations, fired everything and then engaged with disc riders or something so he could add his Firefight shots. After four games with this walking temple of mediocrity I decided to analyse it mathematically and I came up with essentially the same results as Chaos and Evil did earlier in the thread.
I took it bit further noting that the Tzeentch cannons are the same as Gatling Blasters with a poorer range, and that the Beam of Impotence is actually significantly worse than the Plasma Cannon. Cripplingly so. In a single turns shooting, the Plasma Cannon will cause 2.5 macro hits (probability-wise), whereas the Beam will cause .99 hits. Even if the reaver fires the Beam for two consecutive turns, it will cause less damage then the Plasma Cannon firing once. That's not right
I also noted the Warp Flame as well as the extra 1-in-6 chance of the better firefight value adding up to one extra save the enemy has to take due to the 6 dice the reaver has in engagements, if i'm not mistaken.
As I said before, I could simply be missing something but I feel that the battle titans in this list are duds. They feel like a handicap but with the unwealdy nature of the infantry formations, coupled with the expense of all formations in this list large or small make the handicap unnecessary, IMO.
The TS already have precious little in ranged support, and looking at the Black Legion list, I'm thinking that their titans would be much more useful. The battle titans in most other lists bring usually bring something new to the army but aside from their resilience the Suns of Damnation seem to be "more of the same".
That said I think the beam of power needs to be tweaked. Either a greater range or maybe bumping it up to MW4+, maybe?
I noticed on another thread that there is a full Suns of Damnation Legion list in the works, and I would like to suggest:
1.) Some kind of ranged firepower other than a Warmonger
2.) Something that messes with the other army, like disrupt or something that lowers the opponents SR or something. This could be worked on in the TS list too; they are always portrayed as using magic and Tzeentchiness to mess with the opposing army but there is nothing in the list aside from pyrotechics. Just a thought.
P.S. Reviewing this post it may come across that I'm complaining too much; I'm not trying to, it's just stuff I noticed. My computer also crashed and I had to write this post twice. This is the abridged version.