I happen to think it's the complete opposite. Everyone knows how to hold on CT side these days, so the T's have a much harder job of trying to gain any map control. Kinda relies on specific set strats to get anywhere, but a random CT push can screw the whole plan. It's become very CT sided, imo.
I like Mirage, personally, but I do think it needs a small rework. Nothing too drastic, just needs freshening up and giving the T's like 1% better chance of gaining map control.