I'd hate to say it but yes your points are true. His range even in his first season and those times of good periods of play were 'limited'. However, playing in a super slow formation (i.e no runners, no spacing etc), team mates scared of the ball when pressed, scared of making mistakes etc etc will make any midfielder look average and his attacking strengths are currently not being exploited. Herrera should be our version of Matuidi and Rakitic etc i.e the running, the tackling, the overlaps, the extra option in midfield couped with the passing nous. Veratti and Motta wouldn't work and neither would Iniesta and Busquets on their own. Likelywise Modric and Kroos didn't work (consistently) and it was only when Zidane brought in an extra midfielder did they find more stability. Herrera shouldn't be expected to replace your no 10 or defensive midfielder. That should be Miki/Pogba's jobs and Schneiderlin/Schweini's respectively.