As others have stated before, everyone has different opinions on not only pellet cookers in general, but also the debate on brand of rig.
I have had my Traeger Pro 34 for about four months now. For a novice looking for something easy to use and not have to tend to fires, it has been great. I have had no issues.
The two main things I see as being concerns of pellet cookers are:
1) Less Smoke - I may not have a ton of past experiences to compare to, but I have felt like my Traeger puts off enough smoke. Yes, higher temps definitely produce less smoke. The
A-MAZE-N pellet tube is a common accessory to help with smoke.
2) Temp Fluctuations - as with anything with an open flame, there will be some temperature fluctuations. With pellet cookers, from what I have seen, you just need to accept that your cook temp will fluctuate over the entire cook. You should look at more of an average, rather than the temp at one specific point in time. Over a 10+ hour cook, there is too many variable and length of time to fret over fluctuations at specific moments in time. Yes, if a pellet cooker is fluctuating 75*+, I would not consider that normal so may want to check that out.
Overall, I really enjoy the pellet cooker route and specifically, I've been very happy with my Traeger. It appears that Traeger has improved in several areas over the past couple of years. My dad has had two Green Mountain pellet grills and has had great success with them.