I'm starting to get a little frustrated. But before I run off to General to post a "WTF BLIZZ WHY U H8 ROUGES???!!" thread (okay, I wouldn't actually do it like that) I thought I'd come here for some help/advice, because maybe I'm just missing something. A few relevant bits about myself to get started:
• I'm basically a casual solo player who occasionally dabbles in group content, so I'm not looking for advice about dungeon/raid performance.
• My "main" has been my ret paladin since I started playing in early Wrath. She remained my main through Cata, but I rolled and leveled this rogue during Cata and had a lot of fun with her. Prior to Cata I could never manage to get a rogue past about level 20 before I got frustrated and gave up, but something - I know not what - changed with Cata and I suddenly "got" the class. So anyway, MoP arrived and I decided to designate this toon as my "main" for the expansion. It's been mostly fun so far.
• I'm happy with my damage output and comfortable with my rotation. It's not "raid level" of course, but like I said, I don't raid. My DPS is adequate for questing and dailies — I hit things, they die, and I don't … mostly.
My problem, as stated in the thread title, is survivability in specific situations. This is behind my joke about making a "WTF..." thread in General, because with MoP, I've been running into a number of "mechanics" that seem to be either "this should stymie those pesky rogues!" (debuffs that prevent stealth, the worst being those swarms of bugs during the Hidden Master quests with their "no stealth for one minute" debuff; also the sheer number of "summoned" monsters that completely make stealth useless), or else "we completely forgot rogues exist when we came up with this" (the almost-nonstop "swarms" of mobs that seem to assume that everybody is either a tank or has powerful AoE).
The first two mechanics are mainly annoyances. With the debuffs I can simply find a safe place to stand and wait for them to wear off. And the "summoned" monsters simply deprive me of my Shadowstep -> Ambush opener, making them take a little bit longer to kill.
My problem is the "swarms" of mobs. The small, weak ones are easy to kill, but they completely drain my Energy - they die so quickly that I can't get CPs built up to use finishing moves to replenish. The only way I've found to get around this is to Hemo -> 1-CP Eviscerate over and over. But I can survive these as long as I don't get completely overwhelmed by sheer numbers (GL daily with "Unleashed Spirits", I'm looking at you).
Where I'm really getting hosed is when I can't avoid multiple, full-strength mobs, or the small adds when I'm fighting a big mob. Most of the really big mobs, like that stone behemoth in the first part of the GL dailies, once I figure out their mechanics and learn how to avoid their big attacks, I can solo them (though I'm still glad for help). But for big mobs like Bloodtip, who start summoning mass numbers of small adds, I quickly get overwhelmed and die. Last time I tried to solo her (I got tired of waiting for somebody else to come along) I had her down to about 5% when her adds buried me. Then, yesterday, I was trying to do Shado-Pan dailies against mantids. I'm already at a disadvantage since mantids can "see" through stealth if you're moving. When it came time to try to kill the elite mantids, as soon as they feared me and sent me running through other nearby mobs it was all over. I simply cannot survive being attacked by 4+ regular-strength mobs plus an elite at the same time. Yeah, I have my EMfH racial to cancel the fear, but it's still a matter of hitting the button before I body-pull anything else, hard to do in an area full of mantid.
The problem, as I see it, is twofold: Rogues just aren't that "tough", and our AoE hits like a wet noodle. Even against those new "weak" mobs, a 5-CP Crimson Tempest still only does around 8k damage vs their 78k+ hit points. 8k might be enough if CT was spammable, but when I have to wait to build up 5 more CP to use it again at full strength, it becomes laughable. Even more laughable if they're normal, full-strength mobs. Frankly, I'm not even seeing the point of CT and FoK at this point.
So, advice? Suggestions? Have I completely overlooked something?