Wrong, wrong, wrong, wrong, wrong - The comments, not the model. This is the limited edition standard bearer as released by GW themselves on their 'skullz' promotion.
So, if he is a "lowly tactical marine" and he is carrying, "the wrong weapons" and that is, "a company standard at best" then take it up with Games Workshop because they designed, cast and 'sold' him.
'Fanboy' comments like this do the site no favours, especially when they are utterly incorrect. In any case, who gives a XXX who Helveticus is anyway?
The paint job itself is not good, but all the basics are there. If you read the articles on the site and take an interest in the forums...and keep painting you will get better. It's inevitatble, so keep at it and ignore the irrelevant comments.