What Tullich Hill does offer is solitude, ( you'll probably have the hill to yourself, which could be a problem if you break your ankle in a water filled pothole! ), and great views from the top. ( The Arrochar Alps are particularly splendid from here. ). You can also bask in a sense of achievement which is proportional to the effort expended, rather than the height of the hill !
Here is the route summery..........

The road up Glen Douglas is a narrow single track road. Parking is limited. I managed to find a grassy verge a few hundred yards west of the farm at Invergroin, which left the road and the passing places clear.
From this parking place walk in a roughly NE direction to gain the SE ridge of the hill. Turn NW to ascend this ridge to the top. Another ridge leads roughly NE from the top, and this was used in descent. Lower down this ridge, veer right ( south ) as the valley between Tullich Hill and Bhein Bhreac is reached. Head south down the valley back to the Glen Douglas road, veering right (west ) towards the car.
Here is the slide show of the route......