They did a ton for the SRV in Engineers. Planetside driving isn't a slide-show anymore. Tire tracks. Improved wave scanner. Improved POIs. Spaceships randomly buzzing around not doing anything? Well, maybe that last one's kind of a wash...
The framerate's the big one, though -- it was basically unusable in 2.0
I don't really see any major improvements to the SRV itself in 2.1. Tire tracks are cool, but they are not really anything vital to the use of the vehicle. The guns are still pea shooters that do very little against even the unshielded skimmers, and the thing gets damaged way too easily doing what the thing should have been designed to do. (Drive around on planets without getting damaged if you hit a rock!)
No... I'll stick with my original observations. They could have done a TON MORE to improve the whole SRV experience. Giving us a way to upgrade the various components like we can with ships, provide more models of SRV that are better suited for various tasks such as extended exploration (longer range with a heavy duty chassis and larger wheels), combat (more powerful weapons and shields) and stuff like that.
Whatever they improved on the wave scanner, I have yet to figure out what that was. Seems like the same old scanner we had since 2.0. And POIs are still just a very broad indicator of surface based debris etc.
As for frame rates... I got much better performance on planets in 2.0 and much nicer and more detailed terrain as well. My high end rig ran 2.0 at a solid and locked 60fps on planets. Now I get stepping and stutter with the same exact settings, plus the terrain looks low resolution and crappy. 2.1 was a major downgrade on planets in my experience, and I have a system than can run games at a locked 60fps at 4k resolutions all day long. Just can't do the same thing with 2.1 at 1080p!
Obviously some resource bugs going on that were not there in 2.0. My benchmarks of fps between the two version don't lie.
