Howcome there is only stupid ARAM to spectate? Where are the ranked ones???

If I had to guess, it's probably that the queues with the new matchmaking are coded as a different game type, and that game type hasn't been added to the Featured Games list thingy yet.

it's because the game is so fucking boring atm it's better to spectate aram

The increased exposure for ARAM is nice though. Naturally, it'd be even better if Dom and TT games showed up as well. Regardless, it's much more interesting than always having (mainly) SR games up there, since there's already a massive flood of places to watch SR games. I'd personally pay more attention to the Featured Spectate box if there was an actual variety of game modes available (and if the game MMRs were a bit higher than the current ARAM ones seem to be).