Drove down from Gurgaon to Ranthambore last week. Google showed up three options
1. Gurgaon - Alwar - Dausa - Lalsot - Ranthambore
2. Gurgaon - Manoharpur - Dausa - Lalsot - Ranthambore
3. Gurgaon - Manoharpur - Kothun - Lalsot - Ranthoambore
Opted for the Manoharpur - Dausa - Lalsot route on the onward journey.
Started around 8.20 am on Diwali day and reached by 4 pm. Had a halt at Old Rao Hotel near Biwadi for the breakfast. Reached Manoharpur around 11.30 and then Dausa by 12.15 noon. Journey till this was very enjoyable. Then the nightmare started - Dausa to Lalsot was(is) a complete mess. This took about 1 hr and 30 mins negating all the smooth drive till then. Once we crossed Lalsot, then the drive to Ranthambore was good again. All in all took about 6 hrs and 30 mins for 345 kms drive.
Gurgaon - Manoharpur - NH48, Overall good, but regular patches where the top layer has eroded. No need to slow down, but a bit uncomfortable. Two tolls, Fastag helped. 170 kms / 70kmph. Two tolls - Shahjahanpur - Rs 130, Mahoharpura - Rs 60
Manoharpura - Dausa - NH148 - Entry from NH48 is still under construction - about 1 km. Once this was crossed, the next 65 kms was butter smooth, one of the best i had driven in the northern part of India. Clearly marked, good dividers and picturesque as well. One toll before half way. Fastag helped. 70 kms / 85 kmph. One toll - Nekawala Plaza - Rs 45
Dausa - Lalsot - NH148 - Just before the Dausa town, need to take right on to the Agra-Jaipur highway and then take left through the ring road to join the Lalsot road after the town. The nightmare started here. The next 30 kms was a torture to drive even in an automatic. Road construction work was(is) going on in the entire 30 km stretch. It was(is) like every one km, the roads were dug up and filled with gravel and concrete patch for the next one km (not yet completed through, with sharp edges and rods protruding on the sides). Maybe one year down the line, the road will be good. But now, if you have (even if you do not have

)a choice please avoid it. Suspension, engine, gearbox, tyres, your legs and passengers will be saved. 40 kms / 25 kmph. Luckily no Toll.
Lalsot - Ranthambore - SH 24 - This was a welcome bliss after the previous 40 kms of hell. Good road. But lot of villages/small towns on frequent intervals and hence need to slow down regularly. Few unmarked speedbreakers, visible during day, but not sure during the night. Need to be wary of these. With farms/cultivation on either side a good soothing drive. 70kms / 65 kmph. Two tolls - but private cars were waived off. Only commercial vehicles were charged.
Return Opted for Lalsot - Kothun - Manoharpur option.
Started around 1 pm after lunch and reached by 10 pm after couple of breaks including dinner at Old Rao Hotel. Googled for other options with drive time. Instead of Lalsot - Dausa, the other option was to go to Kothun and then drive skirting Jaipur to reach Manoharpur. Checked drive time and google maps showed 1km/min drive time which is very good in day time. Additional distance was about 40 kms compared to previous route, but drive time more or less same. Hence opted for this. All in all took about 6 hrs and 45 mins for 385 kms drive.
Lalsot - Kothun - NH23 - This road can be reached by taking a left into the Chaksu-Lalsot link road which comes 2 kms before the Lalsot town starts. Good road and about 3 kms on this, take left to join into NH23.While 1-2 kms of this stretch was bad and made me think to turn back to the hell ride, but maps kept showing very good average speed. Hence kept moving on. After that the road opens up and is a good 4 lane one till Kothun, recently laid, markings not yet done. Definitely better than many roads but not as good as Dausa - Manoharpur stretch. 43 kms / 65 kmph. No toll as yet.
Kothun - Manoharpur - NH52 / NH248 - Good road. Tonk road it is. After 34 kms on this, take a right and go through some outskirts of Jaipur and join the Mahal road for about 7 kms and then join into NH248 and then onto NH48 few kms before Manoharpur. Mahal road and upto NH48, speeds will be low due to high local traffic and people crossing at odd places. 105 kms / 50 kmph. One toll - Barkedha Toll Plaza on NH52 - Rs 90. Fastag works.
Basis this recent experience, would recommend to take the round about way, rather than Lalsot-Dausa stretch atleast for the next 12 months.