The so called "issues" with the 4th gen comes after the 4 GHz barrier. Haswell is a great architecture for mobile and stock systems (specially laptops, great battery life, good performance from the IGP, etc).
The thing a lot of us have been complaining is that over 4 GHz the 4th gen starts heating up like mad and is using too much voltage. Sandy Bridge (i.e 2nd generation) has spoiled a lot of the overclockers - some Sandy chips were doing 5.1 GHz on air, and Haswell pretty much tops out at 4.7/4.8 with water cooling. This affects all overclockers, but has completely no relevance to a laptop. Those are not problems - those are by design. Haswell is much more efficient at 3 GHz and down than all other previously released generations...