The envelope curves you can rather easily change to have other curves (exponential upward/downward)... just route an envelope to it's own decay parameter... positive modulation like this makes the curve more snappy, negative modulation makes it the other way around.
One reason you do not get "beefy" may be because the VCA envelope lowers the output too much... the REV2 is more than capable of doing beefy and loud basses (unless of course you measure all bass to the character of a MOOG)... I often use negative modulation feedback to the VCA envelope because this allow for more of the transient in the bass sound, and also the body of it, to keep it's volume high... in short, the feedback makes the volume stay high longer, and then gradually but quicker and quicker fall down to zero... it actually works pretty nice.
It's true that you have to work a little more to get at some timbres, in contrast to an OB6 or P6 or the like... if one want quick and instant gratification then the P6 and OB6 is probably the better buy... but if you want the flexibility and depth of the REV2, you just have to accept that you will need to learn how to tweak your synth to get those sounds.
I'm sure everyone can agree, that the Curtis chips are a bit limited... no doubt... everything is "on chip" making little possibility to put something "in between" in it's signal path... thus; no independent OSC levels, no pre filter drive etc. etc... but instead you get a much cheaper synth because it's not as costly to manufacture.
During my soundbank creation process over the last 7 months, I certainly bumped into it's disadvantages, it's shortcomings etc... even it's "character" began to bore me a bit because i can hear it in every patch I did... but that's how it is with all synths... they have a certain character, and that's just the way it is... if I had been working on a MOOG ONE for seven months, I'm sure I would have felt the same way too.
REV2 is by no means a bad synth... it has just as many advantages as non-advantages as any other synth out there... just because it's more "thin" does not make it bad... it actually make it suit other purposes better... it may blend well with other more bass heavy machines for example. In my opinion, the REV2 is very well suited to making sound FX, pads and bell sounds, all which do not start to alias in the highs as many digital synths often do.. I'd probably turn to something else for stuff like basses when it needs to get REALLY low and vintage sounding.
If you only wanted ONE synth, i can understand why you would look at something else... but if you collect several synthesizers, and want machines that compliment each other, then I think REV2 is a fantastic bet at a 16 voice analog DCO synth with a hell of a lot of deep features you will not find in anything else... and if you cannot get a nice sound out of it, it's either because you specifically do not like the REV2 character, or because you might want to dig deeper with the synthesis engine and learn it's secrets... and if that takes too long time... get a P6 instead