You have just discovered why Twitch sucks.
Unlike Shaco, he doesn't have a get out of jail free skill, so in teamfights, it's his destiny to die.
HOWEVER, in the super super late game. When Twitch has say.... Black Cleaver, IE, PD, Bloodthirster, etc. all completed. Well. That's a different story. That's Twitch raping everyone time.
Edit: It's actually kinda mean to say Twitch sucks. He does have some strengths and it is fun to play as him. So if you manage to capitalize on his strengths, you'll have a fun time.
Basically, as a roamer, Twitch is god. Not even Shaco is at Twitch roam level. Have you ever been counterjungled by a Twitch? It's horrifying. No escape. Death only. If Twitch can somehow balance roaming with getting a good gold income to get to his super late game mode, then he's basically set for life. Right now, what I see is that a lot of Twitches get the first the roaming part down good... but they get no farm at all and become useless later.
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Edit edit: Oh man, I forgot how fun Tryndamere is. With a bunch of crit chance runes, you can get 60% crit chance with just a zeal. Then you basically have 350 AD xD. Get PD, 80% crit chance. Get IE, 100% (wasted 5% crit chance). Every game is basically gambling with very good odds. With 15 - 50% crit in the early laning phase without items, all you need to do is land just one crit. Just one crit. And you win your lane. I like dem odds!