Kind of on the fence personally. On one hand Id prefer to preserve the "black box" feel of not being sure what exactly is going on. Kind of helps the immersion for me. On the other hand, knowing what's going on, helps debugging immensely. Let alone catching some ###### exploiting something.
One example I was personally involved in (EDIT: not to mention enough time and space to avoid stepping on toes), during several pvp clashes for a particular natural landbridge on Chaos (fording and bridges were only a VERY distant dream at the time), there soon arose some very wonky behavior when it came to taking down a particular player's character. Even the most skilled hardcore pvpers in LO had trouble landing hits, even when it became 4 or more against 1. Hell at one point there was like five of us plus a couple zombie trolls on the char, and it was ridiculous how long it took. (On a related note, that death dropped a player-crafted "Heirloom" armor set, which instead of playing along with the "flavor text" we - in true style as Libila-worshipping, cannibalistic, evil-doers - sacrificed it to our Dark Mistresses' greater glory. Heh fun times).
Unfortunately I digress, the player in question would claim it was due to having ridiculously high shield skills, deep understanding of the CR system, or w/e blather he would spew out on a given day. Long story short, we watched the char like a hawk and scrutinized everything. Granted the player was a long-known convicted cheater on numerous previous occasions, so that helped narrow it down. Shared information with GMs, and the player ended up being caught on at least two exploits.
Yeah sure there's Wurm Universe now, and a much of the game's fundamental algorithms are at the perusal of the public. Though, keep in mind there's quite a bit of difference between the codebases for WU and WO, simply in just bug fixes and new content. Not to mention what the devs intentionally keep out or change.
In addition, I've seen far too many players treat pvp like its a pure numbers game; as a result, they either put off playing pvp till later levels or end up not doing it at all. Sure taking efforts to buff one's CR helps... a lot. However, there is so much more impact even a low CR can have, and I don't mean the hell of dealing with freebie, suicide alts. Although, such chars can be a good example of the kind of shenanigans when one sheds the fear of "dying".
I still to this day snicker when I recall Zerobyte running out balls-naked, wielding scorpion corpses, to beat people even during "serious pvp". Or even further back to the original Sye player with her battle chicken and death stick. Several other similar memories from which I still draw great amusement.
Unfortunately relying on CR as a sole measure simply encourages an elitist form of mindset that discourages new players coming in. Personally its far better to encourage players to just jump into the damned water already and try it out. Focus on skill grinding is better performed when one is distracted having fun with one's mates.