I think 2.5 is a huge improvement over 1.5 but it does have its issues.
I don't think I've been able to load the stand-alone version on the first try once (the Steam version doesn't seem to have this issue). This was an issue with 1.5 too. It'll crash 2-? times before it will finally load. Also, it has crashed too many times to consider while in game.
The panel and switch lighting is really bad in some cases. For example, in the pics below you can hardly tell when the AFS switches on the KA-50 are on (I have tested with and without the RicardoHDcockpit mod) and the A-10's flood light is almost non-existent. Maybe this is being picky but the anti-collision light is pretty bad.
The attached images show the lighting issues I'm talking about. I also have ~60 crash logs too.