Sounds like the 15:0 has a bug, don't agree with you on the 15:10. A while back chess.com rewrote the rules of chess so that you no longer could use your time any way you wanted and only gave you a couple of minutes maximum for any one move. This so flew in the face of the established rules and tradition of chess that they've apparently now had second thoughts. 7.5 minutes in a 15:10 game to think seems a decent compromise. You must lead your life at a frantic pace if you genuinely think 7.5 minutes is a long time. It's probably going to be a generational issue, old farts like me have learned to be patient. 
Problems in timeout mechanism
Sort:
I'm not talking about a game going on with 7.5 minutes to think... I'm talking about a game with no moves played yet... that's abandoned by the other party and you are stuck waiting until it times out and aborts by server in order not to get warned about abandoning to meny games...
Right, but once the clock starts to move we're in "how many minutes maximum do I have to think mode", no? Anyway they obviously have some issues to sort out. I'm sure that once the "new and improved" chess.com is released in a year or so, we'll all look back and have a good laugh at all the troubles that have been left behind. 
I think half the clock to think about the first move is too much for anyone...
I could imagine a grandmaster faceoff with an opponent thinking the opening through and playing quick later on - but this is not the case...
The way the site goes with so meny people not playing a single move in a game - it's just a terrible annoyance.
Hi, In a recent update to the site (played through browser) - timers and timeouts behaivior changed in a way that has several major flaws:
Examples:
15:0 games - When you are black and white never clock never makes a move - you're just stuck there and need to abandon if you don't want the opponent to make a move later on (say in 20-30 minutes when you went for a sandwitch or are playing another game, not noticing that they finally moved).
15:10 games - clock starts right away now - but other side takes 7.5 minutes to time out - which is a very long wait... Again - you need to abort for the very same reason
Now I get a warning from server for aborting games too often - but I waited quite some time for game to automatically abort and it either never hapens or it takes 7.5 minutes.... that's just too much - the 1 minute auto-abort had it's flaws but was still a better option to the current implementation (IMO).