I consider myself in the middle camp, the one that is cautiously optimistic about Cloud gaming. I want to see more of it (in games) to form myself a good opinion. The Drivatar system in Forza 5 was a good, small sample of that. But apart from that and the awful Grunts in Titanfall, it hasn't done much for console gaming lately. So let's wait and see it's usefulness in the near/medium future. But let's not also brush aside its potential benefits, because I think that's where we'll all end up eventually.
However, to call Mark Cerny a "company representative" just like any other guy is unfair. That guy knows more about tech than essentially every one of us here combined. And nothing is stopping Sony from also using Cloud computing, it's not exclusive to Microsoft (though they own a vastly better infrastructure for it and seem more eager to use it). So Mark has not really any advantage to say it doesn't work well right now if he'd actually think it is. /rant =P
I'm not questioning his knowledge. I'm questioning why we'd ever expect him to say anything different. They're currently sitting on a spec advantage, whilst the opposition is arguing that that utilisation of cloud processing would allow them to do things that would somewhat negate that advantage. The last thing anyone should ever expect anyone in the Playstation camp to respond to that claim with would be "yea, they may have a point". It's not about whether they can do the same themselves or not, it's about whether they're choosing to. They
could allow EA Access onto their console, and likely would if they didn't have a conflicting service. However, because they choose not to have it, their official line will be that it's not a good thing to have. Nintendo
could allow Twitch streaming, but because they apparently have no plans to, they'll dismiss the merits of it.
I'm not making any statement about Cerny himself. Just saying that his position means he's not someone you really should ask about the potential merits of any Xbox initiatives.
Also, the Grunts aren't awful.. they're just easy. Their reactions and respones to events around them is very good, and Respawn could easily have made them a frustrating nuisance to fight if they believed that would be beneficial to the game's design. The same implementation is also running the auto-Titans for example.