XD My definition is that a noob is based on play style. Someone who flashes a Jackie and loses horribly - Noob. Someone who flashes a Jackie and loses, but not horribly - Bad. Someone who flashes a Jackie and wins - Meh player Someone who flashes a Frank and wins - Not a noob xD
But level doesn't mean anything. I like to think of myself as being no longer a noob, even if I'm not even a level 40 yet. I just don't play as often, but that doesn't mean anything about the quality of my matches
Once you have enough brainpower to construct a decent deck by yourself and stop playing predictably (throwing half your pillz out on Cell *cough* *cough*), I think you are no longer a newb. Notice how level and collection size has nothing to do with this. NOOBS, on the other hand, are people who buy "good" presets without understanding why they are good in the first place, or *gasp* not even trying to build their own decks. A noob and an experienced player often will have similar decks, but you can differentiate them by watching how they player.
Unfortunately UR is often a percentage game. its not that hard to take the best % (making assumption about what your opponent would do - i.e. ignore the auto-lose line, or inferior lines of play in general) or forced into a 50-50% (or even a beat 2 lines but loses to a third option) situation with the best cards and guesses wrong to lose.
Im not saying a rank 90 can't be a newb, Im saying if we had to just base our opinions on players based on there ranks then a level 90+ in my eyes would not be a newb.
Everyone is quiet right in saying 'Rank doesn't mean anything' but what does?
ELO? No, you can grind to 1300 then get a lucky streak and take it away to 1400+.
1st in a DT? No, just means you can play fast and got a few lucky wins against lower tied players.
High survivor? Again no, it could just be you got lucky and went against a few players who had no clue what they were doing.
At the end of the day this game doesn't take much skill, but a handful of luck and abit of experience, with experience you can predict what your opponent might do and hopefully plan your victory from there.
Just remember boys and girls, experience isn't skill. You can have years of experience in a job doesn't mean your good at it..
I'm not saying its all about level, but there is the general assumption that devotion and time spent at an activity will improve your general skill level, as well as this with every level gained, every game played even, more understanding is gained. although a level 70 may be a noob and lose, i would expect a higher level of play then from a level 20 with more limited experience, and as such i would pay more attention.
the question was regarding the level that you start really paying attention, don't say you always pay attention, because really if you come up against a level 20 in a dt is not like coming upon a level 40 (usually)